Add support for RHEL 8 (#72) #30

Job	Run time
cleanup (gcc)	42s
cleanup (debian-bookworm)	1m 18s
cleanup (rhel-9)	1m 49s
cleanup (rhel-10)	49s
cleanup (debian-bullseye)	31s
cleanup (tools-rippled-documentation)	7s
cleanup (tools-rippled-clang-format)	45s
cleanup (tools-rippled-prettier)	5s
cleanup (ubuntu-noble)	5m 2s
cleanup (tools-rippled-pre-commit)	13s
cleanup (ubuntu-jammy)	53s
cleanup (rhel-8)	4s
cleanup (debian-bullseye)	31s
cleanup (debian-bookworm)	1m 18s
cleanup (tools-rippled-clang-format)	45s
cleanup (rhel-9)	1m 49s
cleanup (gcc)	42s
cleanup (rhel-8)	10s
cleanup (rhel-10)	49s
cleanup (tools-rippled-prettier)	5s
cleanup (ubuntu-jammy)	53s
cleanup (ubuntu-noble)	5m 2s
cleanup (tools-rippled-documentation)	7s
cleanup (tools-rippled-pre-commit)	13s
	24m 42s

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