Merge all Prow CI scripts into one

[travier]

This will increase code re-use and simplify future CI changes.

[miabbott]

Overall approach looks sound, just need to clean up some of the duplicated code and correct things to use RHEL 8.6

[travier]

This is failing on:

+ curl -L http://base-4-11-rhel86.ocp.svc.cluster.local
/src/ci/prow-entrypoint.sh: line 53: src/config/ocp.repo: Permission denied

[miabbott]

I think the permissions problem is due to this:

+ cosa init --transient /src
info: Missing CAP_SYS_ADMIN; using virt
+ mkdir -p src
+ cd src
+ test -e config
+ case "${source}" in
+ ln -s /src/ config

The /src checkout must be created as root when the job starts, but we are running as builder, so we can't write to that location.

Maybe we hack around this by copying /src to $(mktemp -d)/src as a workaround and init from that new repo instead?

[miabbott]

Looks promising

�[36mINFO�[0m[2022-06-09T18:03:55Z] Building src                                 
�[36mINFO�[0m[2022-06-09T18:06:00Z] Build src succeeded after 2m1s               
�[36mINFO�[0m[2022-06-09T18:06:00Z] Building build-test-qemu-img                 
�[36mINFO�[0m[2022-06-09T18:11:40Z] Build build-test-qemu-img succeeded after 5m36s 
�[36mINFO�[0m[2022-06-09T18:11:40Z] Running multi-stage test test-qemu-kola      
�[36mINFO�[0m[2022-06-09T18:11:40Z] Running multi-stage phase pre                
�[36mINFO�[0m[2022-06-09T18:11:40Z] Step phase pre succeeded after 0s.           
�[36mINFO�[0m[2022-06-09T18:11:40Z] Running multi-stage phase test               
�[36mINFO�[0m[2022-06-09T18:11:40Z] Running step test-qemu-kola-test.            

[travier]

Next step in openshift/release#29329 once this one is ready

[miabbott]

/lgtm

Great job, @travier !

[openshift-ci]

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[openshift-ci]

@travier: all tests passed!

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