chore: poll OpenAPI spec and add PR

.github/workflows/poll-openapi.yml

@@ -0,0 +1,42 @@
+name: Fetch Hookdeck OpenAPI
+on:
+  workflow_dispatch: # Manually trigger the workflow
+  schedule:
+    - cron: "*/15 * * * *"
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  fetch-openapi:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Fetch OpenAPI
+        run: curl https://api.hookdeck.com/latest/openapi/fern | jq . > fern/openapi/openapi.json
+
+      - name: Check for Changes
+        id: git-status
+        run: |
+          if [[ -n $(git status --porcelain) ]]; then
+            echo "::set-output name=changed::true"
+          else
+            echo "::set-output name=changed::false"
+          fi
+
+      - name: Create Pull Request
+        if: steps.git-status.outputs.changed == 'true'
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "Update OpenAPI specification"
+          base: main
+          branch: fern/updateOAS
+          author: GitHub Actions <[email protected]>
+          delete-branch: true
+          title: "Update OpenAPI specification"
+          body: "This PR updates the OpenAPI specification."