diff --git a/.github/workflows/review-app-comment-trigger.yml b/.github/workflows/review-app-comment-trigger.yml
new file mode 100644
index 000000000..0d724a636
--- /dev/null
+++ b/.github/workflows/review-app-comment-trigger.yml
@@ -0,0 +1,147 @@
+name: Trigger Review App Deployment from Comments
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  process_comment:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.issue.pull_request && contains(github.event.comment.body, '/deploy') }}
+
+    steps:
+      - name: Checkout code to access workflow file
+        uses: actions/checkout@v4
+
+      - name: Extract available sites
+        id: available_sites
+        uses: mikefarah/yq@de2f77b49cbd40fd67031ee602245d0acc4ac482
+        with:
+          cmd: yq '.on.workflow_dispatch.inputs.site.options[]' '.github/workflows/review-app.yml'
+
+      - name: Format available sites
+        id: format_sites
+        run: |
+          # Format the sites as a comma-separated list, excluding ecospheres
+          AVAILABLE_SITES=$(echo "${{ steps.available_sites.outputs.result }}" | grep -v "ecospheres" | tr '\n' ',' | sed 's/,$//')
+          echo "AVAILABLE_SITES=$AVAILABLE_SITES" >> $GITHUB_ENV
+          echo "available_sites=$AVAILABLE_SITES" >> $GITHUB_OUTPUT
+          echo "Available sites: $AVAILABLE_SITES"
+
+      - name: Get PR details
+        id: pr_details
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const prNumber = context.issue.number;
+            core.setOutput('pr_number', prNumber);
+
+            // Get PR information to verify it's from the same repository
+            const { data: pullRequest } = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: prNumber
+            });
+
+            const isSameRepo = pullRequest.head.repo.full_name === context.repo.full_name;
+            core.setOutput('is_same_repo', isSameRepo.toString());
+
+            return { prNumber, isSameRepo };
+
+      - name: Parse deployment command
+        id: parse_command
+        if: ${{ steps.pr_details.outputs.is_same_repo == 'true' }}
+        run: |
+          COMMENT="${{ github.event.comment.body }}"
+          AVAILABLE_SITES="${{ env.AVAILABLE_SITES }}"
+
+          # Extract sites from command
+          if [[ $COMMENT =~ /deploy\ +([a-zA-Z0-9,-]+) ]]; then
+            SITES="${BASH_REMATCH[1]}"
+
+            # Remove spaces if any
+            SITES=$(echo $SITES | tr -d '[:space:]')
+
+            # If "all" is specified, use all available sites (excluding ecospheres)
+            if [[ "$SITES" == "all" ]]; then
+              SITES="$AVAILABLE_SITES"
+            fi
+
+            echo "SITES=$SITES" >> $GITHUB_ENV
+            echo "sites=$SITES" >> $GITHUB_OUTPUT
+            echo "has_valid_sites=true" >> $GITHUB_OUTPUT
+          else
+            # No site specified, fail
+            echo "No site specified in the deployment command" >> $GITHUB_STEP_SUMMARY
+            echo "has_valid_sites=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Add reaction to comment
+        if: ${{ steps.pr_details.outputs.is_same_repo == 'true' && steps.parse_command.outputs.has_valid_sites == 'true' }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            await github.rest.reactions.createForIssueComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              comment_id: context.payload.comment.id,
+              content: 'rocket'
+            });
+
+      - name: Trigger deployments
+        if: ${{ steps.pr_details.outputs.is_same_repo == 'true' && steps.parse_command.outputs.has_valid_sites == 'true' }}
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const sites = '${{ steps.parse_command.outputs.sites }}'.split(',');
+            const prNumber = '${{ steps.pr_details.outputs.pr_number }}';
+            const availableSites = '${{ steps.format_sites.outputs.available_sites }}'.split(',').filter(Boolean);
+
+            // Create a comment to inform about the deployments
+            let deploymentMessage = `📦 Triggering deployment for site(s): **${sites.join(', ')}**\n\n`;
+            let validSitesFound = false;
+
+            for (const site of sites) {
+              // Skip ecospheres as it's deployed directly by PR events
+              if (site === 'ecospheres') {
+                deploymentMessage += `ℹ️ Note: Site 'ecospheres' is deployed automatically by PR events and will be skipped.\n`;
+                continue;
+              }
+
+              // Validate against available sites
+              if (!availableSites.includes(site)) {
+                deploymentMessage += `⚠️ Warning: Site '${site}' is not recognized and will be skipped.\n`;
+                continue;
+              }
+
+              validSitesFound = true;
+              deploymentMessage += `🚀 Starting deployment for **${site}**...\n`;
+
+              try {
+                await github.rest.actions.createWorkflowDispatch({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  workflow_id: 'review-app.yml',
+                  ref: 'main',
+                  inputs: {
+                    site: site,
+                    pr_number: prNumber
+                  }
+                });
+              } catch (error) {
+                deploymentMessage += `❌ Failed to trigger deployment for ${site}: ${error.message}\n`;
+                continue;
+              }
+            }
+
+            if (!validSitesFound) {
+              deploymentMessage += `\n❌ No valid sites were found to deploy. Please check your command and try again.`;
+            }
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+              body: deploymentMessage
+            });
diff --git a/.github/workflows/review-app.yml b/.github/workflows/review-app.yml
index 572d70eb1..3331bd6cf 100644
--- a/.github/workflows/review-app.yml
+++ b/.github/workflows/review-app.yml
@@ -5,56 +5,80 @@ name: Deploy review app
 on:
   pull_request:
     types: [opened, synchronize, reopened, closed]
+  workflow_dispatch:
+    inputs:
+      site:
+        description: 'Site to deploy (ecospheres, meteo-france, or logistique)'
+        required: true
+        default: 'ecospheres'
+        type: choice
+        options:
+          - ecospheres
+          - meteo-france
+          - logistique
+          - hackathon
+          - defis
+      pr_number:
+        description: 'PR number (required for manual deployments)'
+        required: true
+        type: string
 
 jobs:
   handle_review_app:
     runs-on: ubuntu-latest
     concurrency:
-      group: ${{ github.workflow }}-${{ github.ref }}-${{ matrix.site }}
+      group: ${{ github.workflow }}-${{ github.ref }}-${{ inputs.site || 'ecospheres' }}
       cancel-in-progress: false
-    strategy:
-      matrix:
-        site:
-          - ecospheres
-          - meteo-france
-          - logistique
     permissions:
       deployments: write
-    # only run if the PR is from the same repo
-    if: github.event.pull_request.head.repo.full_name == github.repository && github.event_name == 'pull_request'
+    if: |
+      (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository) ||
+      github.event_name == 'workflow_dispatch'
     steps:
+      - name: Set environment variables
+        run: |
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            echo "SITE_ID=${{ github.event.pull_request.head.ref == 'main' && 'ecospheres' || 'ecospheres' }}" >> $GITHUB_ENV
+            echo "PR_NUMBER=${{ github.event.pull_request.number }}" >> $GITHUB_ENV
+          else
+            echo "SITE_ID=${{ inputs.site }}" >> $GITHUB_ENV
+            echo "PR_NUMBER=${{ inputs.pr_number }}" >> $GITHUB_ENV
+          fi
+
       - name: Debug event
         run: |
           echo "Event name: ${{ github.event_name }}"
           echo "Event action: ${{ github.event.action }}"
-          echo "Pull request state: ${{ github.event.pull_request.state }}"
+          echo "Pull request state: ${{ github.event.pull_request.state || 'N/A' }}"
+          echo "Site ID: ${{ env.SITE_ID }}"
+          echo "PR number: ${{ env.PR_NUMBER }}"
 
       - name: Cloning repo
-        if: github.event.action != 'closed'
+        if: github.event_name == 'workflow_dispatch' || github.event.action != 'closed'
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Start deployment
-        if: github.event.action != 'closed'
+        if: github.event_name == 'workflow_dispatch' || github.event.action != 'closed'
         uses: chrnorm/deployment-action@v2
         id: deployment
         with:
           token: ${{ github.token }}
-          environment: ${{ matrix.site }}-preview
+          environment: ${{ env.SITE_ID }}-preview
           initial-status: in_progress
           transient-environment: true
 
       - name: Create the review app
-        if: github.event.action == 'opened' || github.event.action == 'reopened'
+        if: github.event_name == 'workflow_dispatch' || github.event.action == 'opened' || github.event.action == 'reopened'
         uses: dokku/github-action@master
+        # ignore errors as the app might already exist on workflow_dispatch
+        continue-on-error: true
         with:
           command: review-apps:create
           git_remote_url: ${{ secrets.REVIEW_APP_SSH_URL }}
-          review_app_name: deploy-preview-${{ github.event.pull_request.number }}--${{ matrix.site }}
+          review_app_name: deploy-preview-${{ env.PR_NUMBER }}--${{ env.SITE_ID }}
           ssh_private_key: ${{ secrets.REVIEW_APP_SSH_PRIVATE_KEY }}
-          # omitting this will prevent the app from being built (which is what we want)
-          # branch: 'main'
 
       - name: Set site id as build arg
         if: always()
@@ -65,20 +89,20 @@ jobs:
           key: ${{ secrets.REVIEW_APP_SSH_PRIVATE_KEY }}
           port: 22
           script: |
-            docker-options:add deploy-preview-${{ github.event.pull_request.number }}--${{ matrix.site }} build "--build-arg VITE_SITE_ID=${{ matrix.site }}"
+            docker-options:add deploy-preview-${{ env.PR_NUMBER }}--${{ env.SITE_ID }} build "--build-arg VITE_SITE_ID=${{ env.SITE_ID }}"
 
       - name: Push to dokku
-        if: github.event.action != 'closed'
+        if: github.event_name == 'workflow_dispatch' || github.event.action != 'closed'
         uses: dokku/github-action@master
         with:
           git_remote_url: ${{ secrets.REVIEW_APP_SSH_URL }}
-          review_app_name: deploy-preview-${{ github.event.pull_request.number }}--${{ matrix.site }}
+          review_app_name: deploy-preview-${{ env.PR_NUMBER }}--${{ env.SITE_ID }}
           ssh_private_key: ${{ secrets.REVIEW_APP_SSH_PRIVATE_KEY }}
           git_push_flags: '--force'
           branch: 'main'
 
       - name: Enable SSL with Let's Encrypt
-        if: github.event.action == 'opened' || github.event.action == 'reopened'
+        if: github.event_name == 'workflow_dispatch' || github.event.action == 'opened' || github.event.action == 'reopened'
         uses: appleboy/ssh-action@v1.0.0
         with:
           host: ${{ secrets.REVIEW_APP_SSH_HOST }}
@@ -86,22 +110,30 @@ jobs:
           key: ${{ secrets.REVIEW_APP_SSH_PRIVATE_KEY }}
           port: 22
           script: |
-            letsencrypt:enable deploy-preview-${{ github.event.pull_request.number }}--${{ matrix.site }}
+            letsencrypt:enable deploy-preview-${{ env.PR_NUMBER }}--${{ env.SITE_ID }}
 
-      - name: Destroy the review app
-        if: github.event.action == 'closed'
-        uses: dokku/github-action@master
+      - name: Extract available sites
+        uses: mikefarah/yq@de2f77b49cbd40fd67031ee602245d0acc4ac482
+        id: get-sites
         with:
-          command: review-apps:destroy
-          git_remote_url: ${{ secrets.REVIEW_APP_SSH_URL }}
-          review_app_name: deploy-preview-${{ github.event.pull_request.number }}--${{ matrix.site }}
-          ssh_private_key: ${{ secrets.REVIEW_APP_SSH_PRIVATE_KEY }}
+          cmd: yq '.on.workflow_dispatch.inputs.site.options[]' '.github/workflows/review-app.yml'
+
+      - name: Destroy all review apps
+        if: github.event.action == 'closed'
+        run: |
+          echo "${{ steps.get-sites.outputs.result }}" | while read site; do
+            echo "Destroying review app for site: $site"
+            ssh -i <(echo "${{ secrets.REVIEW_APP_SSH_PRIVATE_KEY }}") \
+                -o StrictHostKeyChecking=no \
+                dokku@${{ secrets.REVIEW_APP_SSH_HOST }} \
+                apps:destroy deploy-preview-${{ env.PR_NUMBER }}--$site || true
+          done
 
       - name: Update deployment status
-        if: github.event.action != 'closed'
+        if: github.event_name == 'workflow_dispatch' || github.event.action != 'closed'
         uses: chrnorm/deployment-status@v2
         with:
           token: ${{ github.token }}
-          environment-url: https://deploy-preview-${{ github.event.pull_request.number }}--${{ matrix.site }}.sandbox.data.developpement-durable.gouv.fr
+          environment-url: https://deploy-preview-${{ env.PR_NUMBER }}--${{ env.SITE_ID }}.sandbox.data.developpement-durable.gouv.fr
           state: ${{ job.status == 'success' && 'success' || 'failure' }}
           deployment-id: ${{ steps.deployment.outputs.deployment_id }}