We've been using bazel-lib tar to make layers for oci_images. It supports adding compress = "zstd".
It has actually been working fine and speeding up our builds quite a bit.
However, as I've updated bazel-lib, the generated tar file now has a .tar.zst extension instead of a .tar extension.
Only now do oci_images complain since they only accept .tar and .tar.gz files.
I'm wondering if it should not already be allowed to take more than just those file extensions since it has been able to handle zstd compressed tars already.