Go builds fail on filesystems that require UTF-8 filenames

I was trying out `dbx_build_tools` for our python project, but ran into an issue again that has been plaguing me for a while. The root cause is an upstream Bazel issue that I described in https://github.com/bazelbuild/bazel/issues/12986.

Basically Go's source tree has one file - a test case for its own support for UTF-8 filenames - that causes Bazel to blow up on filesystems that require filenames to be UTF-8 encoded. Such filesystems include whatever macOS uses these days, as well as ZFS with the `utf8only` flag set (which happens to be the default on Ubuntu when enabling ZFS support at installation time). I've attached a screenshot of the build failure resulting when I run `bazel build @dbx_build_tools//build_tools:bzl-gen`.

`rules_go` added a workaround in https://github.com/bazelbuild/rules_go/pull/2836. It shells out to the system `tar` command for `tar.gz` go archives.