public com.google.protobuf.ByteString getOutputUriBytes() {
      java.lang.Object ref = outputUri_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        outputUri_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Required. Container Registry URI of a container image.
Only Google Container Registry and Artifact Registry are supported now.
Accepted forms:

*  Google Container Registry path. For example:
   `gcr.io/projectId/imageName:tag`.

*  Artifact Registry path. For example:
   `us-central1-docker.pkg.dev/projectId/repoName/imageName:tag`.

If a tag is not specified, "latest" will be used as the default tag.
</pre>

<code>string output_uri = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for outputUri.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ContainerRegistryDestination.java