Remove RHEL7 and scl_enable (#624) #342

Job	Run time
build-and-push (15/Dockerfile.c9s, sclorg, c9s, postgresql-15-c9s, QUAY_IMAGE_SCLORG_BUILDER_USER...	9m 28s
build-and-push (16/Dockerfile.c10s, sclorg, c10s, postgresql-16-c10s, QUAY_IMAGE_SCLORG_BUILDER_U...	50s
build-and-push (16/Dockerfile.c9s, sclorg, c9s, postgresql-16-c9s, QUAY_IMAGE_SCLORG_BUILDER_USER...	9m 11s
build-and-push (13/Dockerfile.c9s, sclorg, c9s, postgresql-13-c9s, QUAY_IMAGE_SCLORG_BUILDER_USER...	9m 30s
build-and-push (16/Dockerfile.fedora, fedora, 16, QUAY_IMAGE_FEDORA_BUILDER_USERNAME, QUAY_IMAGE_...	40s
build-and-push (15/Dockerfile.fedora, fedora, 15, QUAY_IMAGE_FEDORA_BUILDER_USERNAME, QUAY_IMAGE_...	40s
	30m 19s

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