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I'm having trouble following the source. Where exactly does something like `{<http://build_args.MY|build_args.MY>_ARG}` get translated into its `KEY=VALUE` pair for docker image tagging?

I've followed it up to `docker_build_args.py` where `DockerBuildArgs` is getting made, but having trouble seeing the last effort to transform things to environment variables when templated as such.

I'm not seeing where the surrounding braces are stripped off

Unless maybe that's not how the environment returns things?

`DockerInterpolationContext.format` is the probably the method you seek

(and which is used in `docker_build_context.py`)

Got it. Thanks. I think the docker usage is far more complex than my needs so I'll just simplify for now.