immutable tags mean should use sha only not branch names

Author: craignuj

.github/workflows/deploy.yml

@@ -40,5 +40,5 @@ jobs:
           ECR_REPOSITORY: 'ssh_bastion'
           IMAGE_TAG: latest
         run: |
-          docker build -t "$ECR_REGISTRY"/"$ECR_REPOSITORY":latest -t "$ECR_REGISTRY"/"$ECR_REPOSITORY":${{ github.sha }} -t "$ECR_REGISTRY/$ECR_REPOSITORY":${{ github.ref_name }} .
+          docker build -t "$ECR_REGISTRY"/"$ECR_REPOSITORY":latest -t "$ECR_REGISTRY"/"$ECR_REPOSITORY":${{ github.sha }}
           docker push "$ECR_REGISTRY/$ECR_REPOSITORY" --all-tags