test

Document implicit file tasks #890

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (ubuntu-latest, 3.2)	19s
test (ubuntu-latest, 2.4)	42s
test (ubuntu-latest, 3.0)	17s
test (ubuntu-latest, 3.4)	17s
test (ubuntu-latest, 2.7)	50s
test (macos-latest, 2.6)	1m 11s
test (ubuntu-latest, head)	16s
test (macos-latest, 3.0)	29s
test (macos-latest, head)	23s
test (ubuntu-latest, 2.6)	47s
test (ubuntu-latest, 2.5)	47s
test (ubuntu-latest, 3.3)	21s
test (windows-latest, 2.5)	2m 37s
test (windows-latest, 2.6)	2m 42s
test (macos-latest, 2.7)	54s
test (macos-latest, 3.1)	16s
test (ubuntu-latest, 4.0)	20s
test (windows-latest, 3.4)	1m 8s
test (windows-latest, 2.7)	2m 17s
test (macos-latest, jruby)	3m 34s
test (windows-latest, 3.0)	1m 21s
test (macos-latest, 3.4)	22s
test (ubuntu-latest, 3.1)	16s
test (ubuntu-latest, jruby)	4m 17s
test (macos-latest, 3.3)	20s
test (macos-latest, truffleruby)	30s
test (windows-latest, 3.3)	1m 8s
test (windows-latest, 2.4)	2m 0s
test (ubuntu-latest, truffleruby)	51s
test (windows-latest, 3.2)	2m 0s
test (macos-latest, 3.2)	16s
test (macos-latest, 4.0)	16s
test (windows-latest, 3.1)	1m 20s
test (ubuntu-latest, 2.3)	45s
test (windows-latest, head)	1m 13s
test (windows-latest, 4.0)	1m 12s
	38m 37s

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