ci: do not push enterprise image to aws ecr

.github/workflows/build_and_push_docker_images.yaml

@@ -121,6 +121,8 @@ jobs:
           - aws-arm64
           - ubuntu-20.04
         exclude:
+          - registry: 'public.ecr.aws'
+            profile: emqx-enterprise
           - arch: arm64
             build_machine: ubuntu-20.04
           - arch: amd64