chore: only use explicit tag on release

Author: hsilan

.github/workflows/ecr-release.yml

@@ -104,26 +104,30 @@ jobs:
         with:
           registry-type: public
       - name: Create ECR manifest with explicit tag
+        if: github.event.release.name != ''
         id: create-ecr-manifest-explicit
         run: |
           docker manifest create "${{ needs.build-and-upload-image-to-ecr.outputs.ecr_registry_repository }}:${{ github.event.release.name }}" \
             "${{ needs.build-and-upload-image-to-ecr.outputs.full_image_x86_64 }}" \
             "${{ needs.build-and-upload-image-to-ecr.outputs.full_image_arm64 }}"
       - name: Annotate ECR manifest with explicit arm64 tag
+        if: github.event.release.name != ''
         id: annotate-ecr-manifest-explicit-arm64
         run: |
           docker manifest annotate "${{ needs.build-and-upload-image-to-ecr.outputs.ecr_registry_repository }}:${{ github.event.release.name }}" \
             "${{ needs.build-and-upload-image-to-ecr.outputs.full_image_arm64 }}" \
             --arch arm64 \
             --os linux
       - name: Annotate ECR manifest with explicit amd64 tag
+        if: github.event.release.name != ''
         id: annotate-ecr-manifest-explicit-amd64
         run: |
           docker manifest annotate "${{ needs.build-and-upload-image-to-ecr.outputs.ecr_registry_repository }}:${{ github.event.release.name }}" \
             "${{ needs.build-and-upload-image-to-ecr.outputs.full_image_x86_64 }}" \
             --arch amd64 \
             --os linux
       - name: Push ECR manifest with explicit version
+        if: github.event.release.name != ''
         id: push-ecr-manifest-explicit
         run: |
           docker manifest push "${{ needs.build-and-upload-image-to-ecr.outputs.ecr_registry_repository }}:$${{ github.event.release.name }}"