try to fall back to alternate trivy DB database, see aquasecurity/trivy-action#389

Author: mmguero

.github/workflows/zeek-build-push-latest-ghcr.yml

@@ -115,6 +115,8 @@ jobs:
         if: ${{ matrix.platform == 'linux/amd64' }}
         id: trivy-scan
         uses: aquasecurity/trivy-action@master
+        env:
+          TRIVY_DB_REPOSITORY: ghcr.io/aquasecurity/trivy-db,public.ecr.aws/aquasecurity/trivy-db
         with:
           scan-type: 'image'
           scanners: 'vuln'