Add WORKSPACE.bzlmod to Starlark

[petemounce]

Bazel's bzlmod dependency manager involves Starlark files with .bzlmod file extensions.

https://bazel.build/external/migration#workspace.bzlmod

Description

Checklist:

• I am adding a new extension to a language.

  • The new extension is used in hundreds of repositories on github.com

    • Search results for each extension:

      Please note: bazel-y people tend toward monorepos, so high contributor count vs smaller repo count

      • 8k repos: https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.bzlmod+bazel
      • 108 repos: https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.bzlmod+bzlmod

  • I have included a real-world usage sample for all extensions added in this PR:

    • Sample source(s):
      • Teach gitattributes/linguist to highlight bzlmod files bazel-contrib/rules_dotnet#460 -> https://github.com/bazel-contrib/rules_dotnet/blob/master/examples/WORKSPACE.bzlmod
    • Sample license(s):

  • [ ] I have included a change to the heuristics to distinguish my language from others using the same extension.

    Sorry, I don't follow what this one is asking?

[lildude]

The sample needs to be added to this PR.

The docs you referenced also only mentions WORKSPACE.bzlmod and excluding this file from search returns only 7 files, six of which are owned by the same repo so I think it's probably better to add this as a new named file for now and not as a new extension.

[petemounce]

@lildude many thanks for the fast turnaround.

I haven't understood what to do about the sample license(s) part; how to proceed there?

I've adjusted to only aim for WORKSPACE.bzlmod.

[lildude]

I've adjusted to only aim for WORKSPACE.bzlmod.

Thanks. We still need a sample.

[petemounce]

@lildude is something like ln 9650c7c what you have in mind?