Fix tagging (#109)

Author: rithick-ctds

.github/workflows/release-container-image.yml

@@ -47,4 +47,4 @@ jobs:
         with:
           platforms: linux/amd64,linux/arm64
           push: true
-          tags: docker.io/datastax/pulsar-admin-console:$TAG
+          tags: docker.io/datastax/pulsar-admin-console:${{ env.TAG }}