ci: cleanup pr-revision tags on PR closure (#1622)

Author: franzramadhan

.coderabbit.yaml

@@ -18,5 +18,6 @@ reviews:
     - '!**/*.md'
     - '!**/*.txt'
     - '!**/*.lock'
+    - '!**/*.conf'
 chat:
   auto_reply: true

.github/workflows/ci.yml

@@ -139,3 +139,11 @@ jobs:
     with:
       url: ${{ needs.deploy-web-pr.outputs.preview_url }}
     secrets: inherit
+
+  cleanup-pr-revision-web:
+    if: ${{ github.event_name == 'pull_request' && github.base_ref == 'main' && github.event.action == 'closed' }}
+    uses: ./.github/workflows/cleanup_feature_revision.yml
+    with:
+      service: reearth-visualizer-web
+      tag: pr-${{ github.event.pull_request.number }}
+    secrets: inherit

.github/workflows/cleanup_feature_revision.yml

@@ -0,0 +1,46 @@
+name: Remove PR Cloud Run Revision Tags
+
+on:
+  workflow_dispatch:
+    inputs:
+      service:
+        description: 'Service name to remove revision tags.'
+        type: string
+        required: true
+      tag:
+        description: 'Revision tag to remove.'
+        type: string
+        required: true
+  workflow_call:
+    inputs:
+      service:
+        description: 'Service name to remove revision tags.'
+        type: string
+        required: true
+      tag:
+        description: 'Revision tag to remove.'
+        type: string
+        required: true
+
+jobs:
+  remove-revision-tags:
+    runs-on: ubuntu-latest
+    if: github.event.repository.full_name == 'reearth/reearth-visualizer'
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Authenticate to Google Cloud
+      uses: google-github-actions/auth@v2
+      with:
+        service_account: ${{ secrets.GC_SA_EMAIL }}
+        workload_identity_provider: ${{ secrets.GC_WORKLOAD_IDENTITY_PROVIDER }}
+
+    - name: Set up Cloud SDK
+      uses: google-github-actions/setup-gcloud@v2
+
+    - name: Remove revision tags
+      run: |
+        gcloud run services update-traffic ${{ inputs.service }} \
+          --region ${{ secrets.GC_REGION }} \
+          --remove-tags=${{ inputs.tag }} || echo "Warning: Failed to remove tag ${{ inputs.tag }} - it may not exist"