The linux-mips{,64}-rtrk builders appear to have a very outdated version of git installed, which does not support the --object-format flag or the use of sha256 hashes with git. Builds have been failing on these builders since May 2025, when https://go-review.googlesource.com/c/go/+/636475 was landed.

While these builders clearly need to be updated, having builds continue to pass in the interim would be preferable.