ci: add ci test for pull request

[yih-redhat]

This PR will do:

1. Add CI test for each pull request when it is opened, re-opened and synchronized(dev pushed more commits to it).
2. CI test will run on rpm-package based fedora 41 runner (not image mode runner now as there are some un-resolved problems).
3. Only one test case added: test greenboot on bootc fedora 41 qcow2 image

Problems:

1. need to add some secrets into this repo to make CI work.
   Thanks Antonio, secrets already added. These secrets are all my personal accounts, need to apply/use team-used account, secrets are:
   REDHAT_IO_USERNAME,
   REDHAT_IO_TOKEN,
   STAGE_REDHAT_IO_USERNAME,
   STAGE_REDHAT_IO_TOKEN,
   QUAY_USERNAME,
   QUAY_PASSWORD,
   PAT,
   TF_API_KEY

2. The original packit 'tests' job in this repo also uses testing-farm test to run test cases: /packit/installation and /packit/install-and-verify, but somehow with this pr, the same packit 'tests' job turns to run the tmt test plan/test that I added in this pr, instead of it's own test cases. (of course it failed because lack of prepare step)
   Seems there is a conflict with packit here, anyone know why? A possible solution is to remove the 'tests' job in packit, it only runs installation, and our CI test cases covers much more.

3. Should use image-mode runner in CI test as described in https://issues.redhat.com/browse/THEEDGE-4062, but there are some problems for image mode runner need to be fixed.

[say-paul]

lgtm

pipeline failing