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Hello! I'm trying to follow the instructions for creating a custom docker tag but the example might be a little outdated. I've setup a little test plugin but it doesn't seem to be getting invoked by `docker_image`  . Is there a working example somewhere?

<https://www.pantsbuild.org/2.20/docs/docker/tagging-docker-images>

<https://www.pantsbuild.org/2.20/docs/writing-plugins/overview>

Hi :wave:

Not sure of any examples out in the wild (you could try this out adding it over in <https://github.com/pantsbuild/example-docker> as a learning exercise also benefitting the next guy :wink: ) . But those docs should be OK fwict.

You can run a sanity check to verify your plugin is picked up properly with:
```❯ pants DockerImageTagsRequest --help```
You should see your union member class listed in the output here:
````pants.backend.docker.target_types.DockerImageTagsRequest` api type
-------------------------------------------------------------------

A request to provide additional image tags.

activated by : pants.backend.docker
union members:```
