ci: Various refactoring #31

Job	Run time
nightly	2m 6s
fedora	4m 37s
Unprivileged smoke test	2m 5s
Example tests (bls/fedora-compat)	6m 22s
Example tests (bls/fedora)	6m 9s
Example tests (bls/rhel9)	6m 26s
Example tests (unified/fedora)	6m 27s
Example tests (uki/fedora)	6m 27s
Example tests (bls/arch)	4m 9s
Example tests (uki/arch)	4m 33s
Example tests (unified-secureboot/fedora)	6m 28s
Example tests (bls/arch)	4m 19s
Example tests (bls/arch)	4m 11s
Integration tests (centos)	4m 20s
Integration tests (debian)	4m 19s
required-checks	3s
	1h 13m 1s

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