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How do I enable the `export-codegen` goal in my codegen plugin?

Ah. Found it: <https://github.com/pantsbuild/pants/pull/11107/files#diff-b19cd9c378b2ea77a9abfe1c53e2ae49cf4ab5bae94f41c8e1cb8bfc44c74fb2>

Is it working? Should be purely based on registering the correct UnionRule

You can run `./pants export-codegen` with no arguments iirc to get an error message saying what targets it works with 

It said
```Unknown goal: export-codegen
Use `./pants help` to get help.
Use `./pants help goals` to list goals.```
However, once I registered the export codegen rules, the goal showed up and seems to be working.