Change the source of trivy-db to avoid 429 error (#21183)

Signed-off-by: stonezdj <[email protected]>

.github/workflows/nightly-trivy-scan.yml

@@ -30,7 +30,11 @@ jobs:
           format: 'template'
           template: '@/contrib/sarif.tpl'
           output: 'trivy-results.sarif'
-
+        env:
+          # Use AWS' ECR mirror for the trivy-db image, as GitHub's Container
+          # Registry is returning a TOOMANYREQUESTS error.
+          # Ref: https://github.com/aquasecurity/trivy-action/issues/389
+          TRIVY_DB_REPOSITORY: 'public.ecr.aws/aquasecurity/trivy-db:2'
       - name: Upload Trivy scan results to GitHub Security tab
         uses: github/codeql-action/upload-sarif@v3
         with: