Rootless Podman v4 and resource limits working in Github Actions

[jennydaman]

We're developing a platform which integrates with Podman, which we want to test using Github Actions.

Podman v3 is pre-installed for the Github Actions runner image ubuntu-22.04 and it works in rootless mode. However, CPU resource limits do not work:

Error: OCI runtime error: crun: the requested cgroup controller `cpu` is not available

The official documentation has a solution, however it requires the user to log out and back in which isn't possible in a CI environment.

I developed a solution for fixing the above limits problem and also installing the latest Podman in GIthub Actions.

https://github.com/FNNDSC/miniChRIS-k8s/blob/45a6a05a920a9d0cdacb6234cff73f79d1cfae9a/.github/workflows/ci.yml#L15-L40

Since I was unable to find any other solution online, I am sharing mines here hoping it's useful to someone.