Simplify/update GitHub workflow for nightly openapi spec updates (#2297)

Co-authored-by: Suchintan <suchintan@users.noreply.github.com>

.github/workflows/update-openapi.yml

@@ -12,67 +12,13 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Fetch OpenAPI specification
-        run: |
-          npm install -g fern-api
-          fern api update
-
-      - name: Check for changes
-        id: check_changes
-        run: |
-          if git diff --quiet ./fern/apis/api/openapi.json; then
-            echo "No changes detected in OpenAPI specification"
-            echo "changes_detected=false" >> $GITHUB_OUTPUT
-          else
-            echo "Changes detected in OpenAPI specification"
-            echo "changes_detected=true" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Setup GitHub CLI
-        id: setup_cli
-        if: steps.check_changes.outputs.changes_detected == 'true'
-        run: |
-          # Create timestamp for unique branch name
-          TIMESTAMP=$(date +%Y%m%d%H%M%S)
-          BRANCH_NAME="update-openapi-spec-${TIMESTAMP}"
-
-          # Setup branch for changes
-          git config --global user.name "GitHub Actions"
-          git config --global user.email "actions@github.com"
-
-          # Create new branch with timestamp
-          git checkout -b $BRANCH_NAME
-          git add ./fern/apis/api/openapi.json
-          git commit -m "chore: update OpenAPI specification"
-          git push -u origin $BRANCH_NAME
-
-          # Store branch name for PR creation
-          echo "branch_name=$BRANCH_NAME" >> $GITHUB_OUTPUT
-
-      - name: Create Pull Request with GitHub CLI
-        if: steps.check_changes.outputs.changes_detected == 'true'
-        run: |
-          gh pr create \
-            --base main \
-            --head ${{ steps.setup_cli.outputs.branch_name }} \
-            --title "Update OpenAPI Specification" \
-            --body "This PR updates the OpenAPI specification from the official Vapi API endpoint.
-            
-            - Auto-generated by the Update OpenAPI Specification workflow
-            - Source: https://api.vapi.ai/api-json
-            - Generated at: $(date -u +'%Y-%m-%dT%H:%M:%SZ')"
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: PR Result
-        if: steps.check_changes.outputs.changes_detected == 'true'
-        run: |
-          echo "Pull request created successfully!"
-
-      - name: No Changes Result
-        if: steps.check_changes.outputs.changes_detected == 'false'
-        run: |
-          echo "No changes detected in OpenAPI specification. No PR created."
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Update OpenAPI Spec
+        uses: fern-api/sync-openapi@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: 'update-openapi-spec'
+          update_from_source: true
+          add_timestamp: true