Add GitHub Models automation workflows

.github/workflows/auto_assign.yml

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+on:
+  issue_comment:
+    types: [created]
+
+permissions:
+  issues: write
+  models: read
+
+jobs:
+  auto-assign:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if requesting assignment
+        uses: actions/ai-inference@v1
+        id: check-request
+        with:
+          prompt: |
+            Does this comment ask to be assigned to the issue?
+            Respond with only "yes" or "no".
+
+            Comment: ${{ github.event.comment.body }}
+          model: openai/gpt-4o-mini
+          temperature: 0.1
+
+      - name: Handle assignment
+        if: steps.check-request.outputs.response == 'yes'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            // Get all open issues assigned to the commenter
+            const assignedIssues = await github.rest.issues.listForRepo({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              assignee: context.actor,  
+              state: 'open'
+            });
+             // Get all open PRs created by the commenter
+            const pullRequests = await github.rest.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              creator: context.actor, 
+              state: 'open'
+            });
+            // No assigned issues - assign
+            if (assignedIssues.data.length === 0) {
+              await github.rest.issues.addAssignees({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                assignees: [context.actor]
+              });
+            } 
+              // Has assigned issues but no PRs: ask them to finish first
+            else if (assignedIssues.data.length > 0 && pullRequests.data.length === 0) {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: "Please finish your previous assignment before you request to work on another"
+              });
+            } 
+             // Has assigned issues with PRs: assign them
+            else {
+              await github.rest.issues.addAssignees({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                assignees: [context.actor]
+              });
+            }

.github/workflows/pull_request_unrelated_changes.yml

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+name: Check PR Scope
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+permissions:
+  pull-requests: write
+  models: read
+
+jobs:
+  check-scope:
+    runs-on: ubuntu-latest
+    steps:
+      - # Use AI to detect if PR mixes unrelated changes
+      - name: Analyze PR changes
+        uses: actions/ai-inference@v1
+        id: analyze
+        with:
+          prompt: |
+            Analyze this pull request to determine if it contains unrelated changes.
+            A PR should contain logically separate commits for logically separate changes.
+
+            PR Title: ${{ github.event.pull_request.title }}
+            PR Description: ${{ github.event.pull_request.body }}
+
+            Does this PR appear to mix unrelated changes? Respond with only "yes" or "no".
+          model: openai/gpt-4o-mini
+          temperature: 0.1
+      # If unrelated changes detected, remind contributor of guidelines
+      - name: Comment if unrelated changes detected
+        if: steps.analyze.outputs.response == 'yes'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: "This PR appears to contain unrelated changes. The guidelines state: 'Make separate commits for logically separate changes.' Please review [CONTRIBUTING.md](https://github.com/commons-app/apps-android-commons/blob/master/CONTRIBUTING.md) and consider splitting this into separate PRs."
+            });

.github/workflows/suggest_duplicate_bug.yml

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+name: Detect duplicate issues
+
+on:
+  issues:
+    types: [opened, reopened]
+
+permissions:
+  models: read
+  issues: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.issue.number }}
+  cancel-in-progress: true
+
+jobs:
+  continuous-triage-dedup:
+    if: ${{ github.event.issue.user.type != 'Bot' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: pelikhan/action-genai-issue-dedup@v0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          # Optional tuning:
+          # labels: "auto"          # compare within matching labels, or "bug,api"

.github/workflows/welcome_new_contributors.yml

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+name: Welcome New Contributors
+
+on:
+  pull_request:
+    types: [opened]
+
+permissions:
+  pull-requests: write
+  models: read
+
+jobs:
+  welcome:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.author_association == 'FIRST_TIME_CONTRIBUTOR'
+    steps:
+      - name: Generate welcome message
+        uses: actions/ai-inference@v1
+        id: ai
+        with:
+          prompt: |
+            Write a friendly welcome message for a first-time contributor. Include:
+            1. Thank them for their first PR
+            2. Mention checking CONTRIBUTING.md
+            3. Explain that after fixing 5 bugs, they can work on enhancements
+            4. Link to the welcome document: https://github.com/commons-app/commons-app-documentation/blob/master/android/Volunteers-welcome!.md
+            5. Offer to help if they have questions
+
+            Keep it brief and encouraging.
+          model: openai/gpt-4o-mini
+          temperature: 0.7
+
+      - name: Post welcome comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const message = `${{ steps.ai.outputs.response }}`;
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: ${{ github.event.pull_request.number }},
+              body: message
+            });