chore: Add GitHub workflow to sync public API docs (no-changelog) (#15985)

.github/workflows/sync-public-api-docs.yml

@@ -0,0 +1,97 @@
+name: Sync Public API Schema to Docs Repo
+
+on:
+  # Triggers for the master branch if relevant Public API files have changed
+  push:
+    branches:
+      - master
+    paths:
+      # Trigger if:
+      # - any of the public API files change
+      - 'packages/cli/src/public-api/*.{css,yaml,yml}'
+      # - the build script or dependencies change
+      - 'packages/cli/package.json'
+      # - any main dependencies change
+      - 'pnpm-lock.yaml'
+
+  # Allow manual trigger
+  workflow_dispatch:
+
+jobs:
+  sync-public-api:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout Main n8n Repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Setup Environment and Build Project
+        uses: ./.github/actions/setup-and-build
+
+      - name: Build Public API Schema
+        run: pnpm run build:data
+
+      - name: Verify OpenAPI schema exists
+        id: verify_file
+        run: |
+          if [[ -f "packages/cli/dist/public-api/v1/openapi.yml" ]]; then
+            echo "OpenAPI file found: packages/cli/dist/public-api/v1/openapi.yml"
+            echo "file_exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "ERROR: OpenAPI file not found at packages/cli/dist/public-api/v1/openapi.yml after build."
+            echo "file_exists=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Generate GitHub App Token
+        if: steps.verify_file.outputs.file_exists == 'true'
+        id: generate_token
+        uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
+        with:
+          app-id: ${{ secrets.N8N_ASSISTANT_APP_ID }}
+          private-key: ${{ secrets.N8N_ASSISTANT_PRIVATE_KEY }}
+
+      - name: Checkout Docs Repository
+        if: steps.verify_file.outputs.file_exists == 'true'
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          repository: n8n-io/n8n-docs
+          token: ${{ steps.generate_token.outputs.token }}
+          path: public-docs
+
+      - name: Copy OpenAPI file to Docs Repo
+        if: steps.verify_file.outputs.file_exists == 'true'
+        run: |
+          # Destination path within the 'public-docs' checkout directory
+          DOCS_TARGET_PATH="public-docs/docs/api/v1/openapi.yml"
+
+          echo "Copying 'packages/cli/dist/public-api/v1/openapi.yml' to '${DOCS_TARGET_PATH}'"
+          cp packages/cli/dist/public-api/v1/openapi.yml "${DOCS_TARGET_PATH}"
+
+      - name: Create PR in Docs Repo
+        if: steps.verify_file.outputs.file_exists == 'true'
+
+        # Pin v7.0.8
+        uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e
+        with:
+          token: ${{ steps.generate_token.outputs.token }}
+
+          path: public-docs
+          commit-message: 'feat(public-api): Update Public API schema'
+          committer: GitHub <noreply@github.com>
+          author: ${{ github.actor }} <${{ github.actor_id }}+${{ github.actor }}@users.noreply.github.com>
+          signoff: false
+
+          # Create a unique branch and delete after we're done
+          branch: 'chore/openapi-sync-${{ github.run_id }}-${{ github.run_attempt }}'
+          delete-branch: true
+
+          title: 'chore: Update Public API schema'
+          body: |
+            Automated update of the Public API OpenAPI YAML schema.
+
+            This PR was generated by a GitHub Action in the [${{ github.repository }} repository](https://github.com/${{ github.repository }}).
+            Source commit: [${{ github.sha }}](https://github.com/${{ github.repository }}/commit/${{ github.sha }})
+
+            Please review the changes and merge if appropriate.