Use trivy db mirror from ECR instead of GHCR

.gitignore

@@ -4,3 +4,4 @@
 *.tfstate
 kubeconfig.yaml
 .DS_Store
+site/

pipelines/shared-tasks/scan-image-trivy/task.yml

@@ -31,6 +31,7 @@ run:
 
       trivy image \
         --input=image/image.tar \
+        --db-repository public.ecr.aws/aquasecurity/trivy-db \
         --exit-code=1 \
         --severity=HIGH,CRITICAL \
         --ignore-unfixed \