What we need here is:

• golangci-lint (done in Add CI #3, followups in Switch to golangci-lint v2, fix or suppress new warnings #12)
• unit tests (done in Add CI #3, CI: add cgroup v1 (AlmaLinux 8) #6)
• integration tests with runc@HEAD

Alas, cgroup v1 testing won't be possible since ubuntu-20.04 is being decomissioned soon, but I hope we can set up Cirrus CI (or test cgroups@HEAD in runc repo)