script/test-race runs go test -race in a digest-pinned Debian golang
image that has gcc, since the detector needs cgo and the build keeps it
off. The checkout is mounted read-only and the container is removed
afterwards. The tests run as the calling user, or as nobody when that is
root, so the tests that make a file unreadable still see the read fail.
It is not part of make check. The detector found no races.
Model: opus-5-5
