workflow: enable CNCF runners #4797

Job	Run time
Check if we need to update the SDK	4s
Build an updated SDK container	0s
Build the OS image / Build Flatcar packages (amd64)	1h 15m 18s
Build the OS image / Build Flatcar packages (arm64)	1h 3m 16s
Build the OS image / Run kola tests / Run Kola tests (amd64)	2m 9s
Build the OS image / Run kola tests / Merge TAP reports and post results	54s
Check if we need to update the SDK	4s
Build the OS image / Build Flatcar packages (arm64)	1h 3m 16s
Build the OS image / Build Flatcar packages (amd64)	1h 15m 18s
Build the OS image / Run kola tests / Run Kola tests (amd64)	46s
Build an updated SDK container	-5s
Build the OS image / Run kola tests / Merge TAP reports and post results	1m 14s
Check if we need to update the SDK	4s
Build an updated SDK container	0s
Build the OS image / Build Flatcar packages (amd64)	1h 15m 18s
Build the OS image / Run kola tests / Run Kola tests (amd64)	1m 17s
Build the OS image / Build Flatcar packages (arm64)	1h 3m 16s
Build the OS image / Run kola tests / Merge TAP reports and post results	40s
	7h 2m 49s

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