Merge pull request #441 from ruby/rmf-improve-ci #1490

Job	Run time
benchmark-ractor (head)	12m 34s
benchmark-ractor (ruby)	12m 58s
benchmark-default (truffleruby)	24s
benchmark-default (head)	11m 2s
benchmark-default (ruby)	11m 13s
benchmark-run-once	1m 33s
benchmark-ractor (truffleruby)	17s
test (head)	10s
test (ruby)	10s
test (truffleruby)	21s
benchmark-ractor-only (head)	48s
benchmark-ractor-only (truffleruby)	12s
benchmark-graph	48s
benchmark-ractor-only (ruby)	54s
all-tests	2s
	53m 26s

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