NO-JIRA: refactor(.github/workflows): use JSON-based platform runner mapping and add README for runners, then add IBM runners

[jiridanek]

• New Project: opendatahub-io/notebooks IBM/actionspz#63

Description

Creating LVM Volume.
  Creating LVM PV on root fs.
losetup: cannot find an unused loop device: No such file or directory
  No device found for .

The IBM runners are containers, not VMs, so I can't do these partitioning operations. And there isn't a separate volume for /mnt (or any other directory) anyways, so there is no point to it.

This is easy to make conditional, no big deal.

Homebrew on Linux is only supported on Intel x86_64 and ARM64 processors!

This is a significant problem; so far we used Homebrew to get latest (recent) Podman.

• Ubuntu 24.04 has relatively recent Podman 4.x already, so maybe we should just use the distro podman
• There was the Suse opensource build service build we may use
• Some random person is publishing statically linked podman binaries on github
• nixpkgs probably has broader platform support than homebrew
• Fedora chroot could be created
  • already planned this in Installing latest Podman from Homebrew on arm64 Linux is failing #2577

For sure it would be strange to maintain multiple ways of getting podman, so if we proceed with IBM runners, then Homebrew for Linux is most likely out.

The trouble with switching to OS version of Podman is that the config files assume currently Homebrew, so I'd need to change the configs.

How Has This Been Tested?

Let's see if the IBM runners will activate on a PR; if not

• https://github.com/opendatahub-io/notebooks/tree/jd_ibm_runners

In fact they do activate for PRs, so that's good!

• https://github.com/opendatahub-io/notebooks/actions/runs/20227795523/job/58063288756?pr=2774

Self checklist (all need to be checked):

• Ensure that you have run make test (gmake on macOS) before asking for review
• Changes to everything except Dockerfile.konflux files should be done in odh/notebooks and automatically synced to rhds/notebooks. For Konflux-specific changes, modify Dockerfile.konflux files directly in rhds/notebooks as these require special attention in the downstream repository and flow to the upcoming RHOAI release.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

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