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Just to clarify, you can't include extra docker image tags via the CLI right? You also can't

```[docker.registries.foo]
address = "us-docker.pkg.dev"
repository = "foo/{name}"
extra_image_tags=["{build_args.BUILD_NUMBER}"]```
and then `pants --docker-registries='@foo' publish demo` ?

I think I'm trying to misuse "registry" here as an alias for a group of configuration since I'm getting

```DockerRegistryAddressCollisionError: Duplicated docker registry address for aliases: i-amlg-dev, i-amlg-prod. Each registry `address` in `[docker].registries` must be unique. ```

In CI we have two pipelines. One is a "feature" pipeline for running when someone is working on a feature branch and another is when we merge into main.

I want to start including a "build number" in the main pipeline. but not feature pipeline. I suppose I could configure `PANTS_CONFIG_FILES` to point to different files

Alternatively just have a fake build number like 0 for the feature pipeline

You can also use environment variables in the config file. You can conditionally set env vars in `.pants.bootstrap`