Add slack notification upon release published

.github/workflows/build-push.yml

@@ -1,9 +1,6 @@
 name: build preview
 
 on: 
-  release: 
-    types: 
-      - published
   pull_request:
     branches:
       - "*"

.github/workflows/release-build.yml

@@ -0,0 +1,24 @@
+name: Build preview on documentation repo upon release publish
+
+on: 
+  release: 
+    types: 
+      - published
+
+env:
+  OWNER: nginx
+  REPO: documentation
+
+jobs:
+  trigger-documentation-build:
+    runs-on: ubuntu-latest
+    steps: 
+     - name: Trigger 'Build and deploy' workflow in 'documentation' repo
+       run: |
+        curl -L \
+            -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ secrets.DOCUMENTATION_SLACK_FLOW_PAT }}" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            "https://api.github.com/repos/${{ env.OWNER }}/${{ env.REPO }}/dispatches" \
+            -d "{\"event_type\": \"trigger-preview-build\", \"client_payload\": {\"environment\": \"preview\", \"hugo_theme_override\": \"\", \"author\": \"${{ github.event.release.author.login }}\", \"tag_name\": \"${{ github.event.release.tag_name }}\", \"release_name\": \"${{ github.event.release.name }}\"}}"

.github/workflows/slack-notification.yml

@@ -0,0 +1,49 @@
+name: Slack notification for new theme release
+
+on:
+  repository_dispatch:
+    types: [trigger-slack-notification]
+
+permissions:
+  contents: read
+
+jobs:
+    release-notification:
+        runs-on: ubuntu-latest
+        permissions:
+          contents: read
+          actions: read # for 8398a7/action-slack
+          checks: read
+        steps:
+          - name: Send notification
+            uses:  8398a7/action-slack@1750b5085f3ec60384090fb7c52965ef822e869e # v3.18.0
+            with:
+                status: custom
+                custom_payload: |
+                  {
+                      username: 'Github',
+                      mention: 'channel',
+                      attachments: [{
+                        title: `New theme release - ${{ github.event.client_payload.release_name }}`,
+                        color: '#009223',
+                        fields: [
+                        {
+                          title: 'Tag',
+                          value: ${{ github.event.client_payload.tag_name }},
+                          short: true
+                        },
+                        {
+                          title: 'Author',
+                          value: ${{ github.event.client_payload.author }},
+                          short: true
+                        },
+                        {
+                          title: 'Preview URL',
+                          value: ${{ github.event.client_payload.previewURL }},
+                          short: true
+                        }]
+                      }]
+                  }
+            env:
+              SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
+              SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}