feat(actions): delete old GCP resources (#4598)

* feat(actions): delete old GCP resources

* fix(ci): delete old instances templates

* fix(actions): use correct date arguments and conversion

* fix(actions): missing command in gcloud

* fix(gcp): if an instance can't be deleted, continue

* refacor(action): cleanup and execute monthly

.github/workflows/delete-gcp-resources.yml

@@ -0,0 +1,33 @@
+name: Delete GCP resources
+
+on:
+  schedule:
+    - cron: "0 0 1 * *"
+  workflow_dispatch:
+
+jobs:
+  delete-resources:
+    name: Delete old GCP resources
+    runs-on: ubuntu-latest
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+    steps:
+      # Setup gcloud CLI
+      - name: Authenticate to Google Cloud
+        id: auth
+        uses: google-github-actions/auth@v0.8.0
+        with:
+          workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
+          service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
+          token_format: 'access_token'
+
+      # Deletes all the instances template older than 30 days
+      - name: Delete old instance templates
+        run: |
+          TEMPLATES=$(gcloud compute instance-templates list --sort-by=creationTimestamp  --filter="creationTimestamp < $(date --date='30 days ago' '+%Y%m%d')" --format='value(NAME)')
+
+          for TEMPLATE in $TEMPLATES
+          do
+            gcloud compute instance-templates delete ${TEMPLATE} --quiet || continue
+          done