Unbuild Docker Environments

Remove EL7 and EL8 (but not OL8) from build actions. #154

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Run time

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Job	Run time
build (ol8)	2m 47s
build (el9)	1m 33s
build (d11)	23m 35s
build (d12)	22m 38s
build (u18)	20m 11s
build (u20)	21m 25s
build (u22)	22m 31s
build (u24)	1h 6m 24s
	3h 1m 4s