Fix podman detection in CI scripts

[Noratrieb]

When docker-podman compat was set up in a way that causes "docker" to be the argv[0] of podman, the previous detection did not work. This was for example the case in the compat package from nixpkgs.

This checks the output and should work everywhere.

I tested it locally by executing

if [[ "$id" != 0 && "$(docker version)" =~ Podman ]]; then
    echo yes
else
    echo no
fi

which printed no before, and yes now.

fixes #113129

r? cuviper

[cuviper]

Thanks!

@bors r+ rollup

[bors]

📌 Commit 6ab84b5 has been approved by cuviper

It is now in the queue for this repository.