ci: add update-maintainers.yml

Create workflow for updating maintainers list.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

.github/workflows/update-maintainers.yml

@@ -0,0 +1,131 @@
+name: Update maintainers list
+on:
+  schedule:
+    # Update every Monday at 9 AM UTC
+    - cron: "0 9 * * 1"
+  workflow_dispatch:
+    inputs:
+      create_pr:
+        description: 'Create PR even if no changes'
+        required: false
+        default: false
+        type: boolean
+jobs:
+  update-maintainers:
+    runs-on: ubuntu-latest
+    if: github.event_name != 'schedule' || github.repository_owner == 'nix-community'
+    steps:
+      - name: Create GitHub App token
+        uses: actions/create-github-app-token@v2
+        id: app-token
+        with:
+          app-id: ${{ vars.CI_APP_ID }}
+          private-key: ${{ secrets.CI_APP_PRIVATE_KEY }}
+      - name: Get GitHub App user info
+        id: user-info
+        env:
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
+          slug: ${{ steps.app-token.outputs.app-slug }}
+        run: |
+          name="$slug[bot]"
+          id=$(gh api "/users/$name" --jq .id)
+          {
+            echo "id=$id"
+            echo "name=$name"
+            echo "email=$id+$name@users.noreply.github.com"
+          } >> "$GITHUB_OUTPUT"
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31
+      - name: Setup Git
+        run: |
+          git config user.name "${{ steps.user-info.outputs.name }}"
+          git config user.email "${{ steps.user-info.outputs.email }}"
+      - name: Generate updated maintainers list
+        run: |
+          echo "📋 Generating updated all-maintainers.nix..."
+          python3 ./scripts/generate-all-maintainers.py
+      - name: Check for changes
+        id: check-changes
+        run: "if git diff --quiet all-maintainers.nix; then\n  echo \"No changes to all-maintainers.nix\"\n  echo \"has_changes=false\" >> \"$GITHUB_OUTPUT\"\nelse\n  echo \"Changes detected in all-maintainers.nix\"\n  echo \"has_changes=true\" >> \"$GITHUB_OUTPUT\"\n  \n  # Get change statistics\n  added=$(git diff --numstat all-maintainers.nix | cut -f1)\n  removed=$(git diff --numstat all-maintainers.nix | cut -f2)\n  echo \"changes_summary=+$added -$removed lines\" >> \"$GITHUB_OUTPUT\"\nfi\n"
+      - name: Validate generated file
+        if: steps.check-changes.outputs.has_changes == 'true'
+        run: |
+          echo "🔍 Validating generated all-maintainers.nix..."
+          if nix eval --file ./all-maintainers.nix --json > /dev/null; then
+            echo "✅ Generated file has valid Nix syntax"
+          else
+            echo "❌ Generated file has invalid Nix syntax"
+            exit 1
+          fi
+      - name: Create Pull Request
+        if: steps.check-changes.outputs.has_changes == 'true' || github.event.inputs.create_pr == 'true'
+        env:
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
+        run: |
+          # Create a new branch for the update
+          branch_name="maintainers/update-$(date +%Y%m%d%H%M%S)"
+          git checkout -b "$branch_name"
+
+          # Commit the changes
+          git add all-maintainers.nix
+          git commit -m "maintainers: update all-maintainers.nix
+
+          Automated update of the master maintainers list combining:
+          - Home Manager specific maintainers from modules/lib/maintainers.nix
+          - Nixpkgs maintainers referenced in Home Manager modules
+
+          Changes: ${{ steps.check-changes.outputs.changes_summary || 'No content changes' }}
+
+          Generated by: scripts/generate-all-maintainers.py"
+
+          # Push the branch
+          git push origin "$branch_name"
+
+          # Create the pull request
+          gh pr create \
+            --title "maintainers: update all-maintainers.nix" \
+            --body "$(cat <<'EOF'
+          ## 📋 Summary
+
+          This PR updates the master maintainers list (`all-maintainers.nix`) which combines:
+          - **Home Manager specific maintainers** from `modules/lib/maintainers.nix`
+          - **Nixpkgs maintainers** referenced in Home Manager modules
+
+          ## 🔄 Changes
+
+          **Statistics:** ${{ steps.check-changes.outputs.changes_summary || 'No content changes (format/comment updates only)' }}
+
+          The updated list includes all maintainers needed for review assignments across the Home Manager project.
+
+          ## 🤖 Automation
+
+          - **Generated by:** `scripts/generate-all-maintainers.sh`
+          - **Trigger:** ${{ github.event_name == 'schedule' && 'Scheduled weekly update' || 'Manual workflow dispatch' }}
+          - **Validation:** File syntax verified with `nix eval`
+
+          ## 📚 Usage
+
+          This file can be imported and used for maintainer lookups:
+          ```nix
+          let allMaintainers = import ./all-maintainers.nix; in
+          # Access any maintainer by name: allMaintainers.username
+          ```
+
+          ---
+          🤖 *This PR was automatically created by the [update-maintainers workflow](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})*
+          EOF
+          )" \
+            --label "dependencies" \
+            --label "maintainers"
+      - name: Summary
+        run: |
+          if [[ "${{ steps.check-changes.outputs.has_changes }}" == "true" ]]; then
+            echo "✅ Successfully created PR with maintainer updates"
+            echo "📊 Changes: ${{ steps.check-changes.outputs.changes_summary }}"
+          else
+            echo "ℹ️  No changes detected - maintainers list is up to date"
+          fi