[FR] Support the usage of Buildozer present on host about buildozer

[fmeum]

Thanks for the detailed feature request! We can certainly add this capability if we can't find a better solution for your use case.

The motivation behind fetching a pinned version of buildozer in the first place is to ensure that bazel mod tidy formats end edits consistently across different developer's machines working on a single project. By introducing the capability to use buildozer from the host, that guarantee is lost.

A proxy that allows you to go install arbitrary things but blocks all .exe downloads does, admittedly, sound a bit inconsistent. In a more restricted environment, using buildozer from the host may again not be convenient.

Because of this, I would first like to explore alternatives. A downloader config is one that's pretty standard. Does it work for you? If not, could you see bazel vendor being an alternative, which would allow you to vendor the buildozer binaries into your repo while still having them managed by Bazel?