Setup periodic tests actions for IRSO

[tuminoid]

Similar to BMO periodics, we need to setup the same for IRSO branches, especially if we now start maintaining release-x.y branches.

After periodics are implemented, add their build badges to the README.md files of each branch respectively and add the line about updating build badges back to docs/releasing.md.

Ref: https://github.com/metal3-io/baremetal-operator/blob/main/.github/workflows/e2e-test-periodic-main.yml

/kind ci

[Rozzii]

/triage accepted