[FR]: tar is non-hermetic when compress is set to zstd

[ewhauser]

What is the current behavior?

When tar is configured using compress = "zstd", it looks for zstd on the path. If the zstd_toolchain is registered, then we should append this to path.

Describe the feature

We want to make tar hermetic when using zstd compression.

[alexeagle]

The bug is actually in the BCR entry for libarchive, see https://github.com/aspect-build/bazel-lib/pull/878#issuecomment-2225981766

[mattem]

Related to a Slack conversation