v1 lacked gcc, so 'go test -race' (in Makefile) failed in CI with 'go: -race requires cgo'. v2 of the runner image installs gcc, libc6-dev, and pkg-config.
v1 lacked gcc, so 'go test -race' (in Makefile) failed in CI with 'go: -race requires cgo'. v2 of the runner image installs gcc, libc6-dev, and pkg-config.