Add libkrun Mac task

[cevich]

Depends on: containers/automation#208 + deployment into worker pool.

Does this PR introduce a user-facing change?

None

[cevich]

Initial test-run

• All but one (not a flake) of the Mac PM tests pass w/ libkrun. Looked at the code for the failure, can't understand the test or why it would fail with a "file no found" error.
• All of the Mac PM tests fail w/ applehv. Suspect it has to do with needing to comment out the installation of vfkit[0].

0. Note: w/o brew install vfkit commented out, the brew install krunkit command fails with some "unlink" error. It's essentially complaining that /some/path/bin/vfkit already exists.

[cevich]

Testing note: Confirmed (expected) libkrun tests all fail when run on Mac's w/o libkrun.

[cevich]

Opened #23296

[cevich]

@edsantiago and/or @baude if you want to give the first two commits an initial look over, this PR is code-complete once containers/automation#208 is merged and deployed to the pool management VM (after I'm back from PTO).

[cevich]

FYI- I'll be off on PTO next week, so won't be enabling libkrun testing in Podman until I return. There are changes needed on the Mac's used for CI and I don't want to risk breaking something while I'm away.

[edsantiago]

Tentative LGTM with two concerns

[cevich]

The libkrun mac tests are also passing. I will merge containers/automation#208 shortly, then after a day or so this PR can have final review and testing performed (i.e. after the pool has updated).

[cevich]

This PR can move forward on/after 2024-08-01T18:50:12+00:00, by then all the Macs in the pool will be running the new setup.

[cevich]

Force-push:

• Removed DO NOT MERGE commit to clear up diff (this still isn't ready to merge).
• Renamed mac TEST_FLAVOR values to be consistent w/ other podman-machine testing tasks.
  (so they all sort together in the status page).

[cevich]

This is ready for final review and (assuming CI passes) merging.

[cevich]

Looks like the MacOS PM tests are both green, applehv and libkrun

[rhatdan]

LGTM
@mheon @baude @Luap99 PTAL

[mheon]

/lgtm

[rhatdan]

/approve

[openshift-ci]

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