Merge pull request #62 from eregon/truffleruby-ci #106

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.7 / ubuntu-latest)	28s
build (2.7 / macos-latest)	1m 2s
build (2.7 / windows-latest)	4m 12s
build (3.0 / ubuntu-latest)	15s
build (3.0 / macos-latest)	36s
build (3.0 / windows-latest)	2m 6s
build (3.1 / ubuntu-latest)	13s
build (3.1 / macos-latest)	37s
build (3.1 / windows-latest)	1m 47s
build (3.2 / ubuntu-latest)	16s
build (3.2 / macos-latest)	44s
build (3.2 / windows-latest)	3m 34s
build (head / ubuntu-latest)	13s
build (head / macos-latest)	42s
build (truffleruby-head / ubuntu-latest)	52s
build (truffleruby-head / macos-latest)	1m 48s
build (mswin / windows-latest)	1m 57s
build (mingw / windows-latest)	3m 55s
	25m 19s

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