Build and test container images

If POOL is a hostname or host:port then use it as a central manager as opposed to bailing out #684

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Run time

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Job	Run time
build-images (el9, 3.6, development)	8m 53s
build-images (el9, 3.6, testing)	7m 30s
build-images (el9, 3.6, release)	7m 57s
build-images (el9, 23, testing)	6m 47s
build-images (el9, 23, release)	10m 4s
build-images (al8, 3.6, development)	7m 11s
build-images (al8, 3.6, testing)	7m 19s
build-images (al8, 3.6, release)	7m 30s
build-images (cuda_11_8_0, 3.6, release)	8m 0s
build-images (cuda_11_8_0, 23, release)	12m 22s
	1h 23m 33s