Podman: change default runtime to crun

[ltrsunny]

crun is a lighter and more popular choice now.

Testing the changes

• I tested the changes in this PR: YES|briefly|NO

[ahesford]

I don't know about lightness or popularity, but last time I checked, rootless podman won't work at all with runc because it can't control cgroups as it expects. Switching seems fine to me, but I don't know if there are adverse consequences that we'd want to avoid.

cc: @CameronNemo

[ltrsunny]

I don't know about lightness or popularity, but last time I checked, rootless podman won't work at all with runc because it can't control cgroups as it expects. Switching seems fine to me, but I don't know if there are adverse consequences that we'd want to avoid.

cc: @CameronNemo

I also found this problem on openwrt before, crun works well but runc cannot.

[CameronNemo]

rootless podman won't work at all with runc because it can't control cgroups as it expects

this does not seem to be the case at all for me. but whatever it is just a default.

[CameronNemo]

FYI podman and conmon need updates. And the default runtime for buildah should be changed too.

[ahesford]

I just did a test and found that my previous issue with rootless podman and runc no longer exists; runc works just fine for me.

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