build

Add TruffleRuby in CI #1471

Job	Run time
ruby-versions / Generate Ruby versions	1s
build (2.6 / ubuntu-latest)	28s
build (2.6 / macos-latest)	32s
build (2.6 / windows-latest)	3m 57s
build (2.7 / ubuntu-latest)	30s
build (2.7 / macos-latest)	29s
build (2.7 / windows-latest)	2m 46s
build (3.0 / ubuntu-latest)	18s
build (3.0 / macos-latest)	17s
build (3.0 / windows-latest)	1m 46s
build (3.1 / ubuntu-latest)	15s
build (3.1 / macos-latest)	17s
build (3.1 / windows-latest)	2m 6s
build (3.2 / ubuntu-latest)	21s
build (3.2 / macos-latest)	15s
build (3.2 / windows-latest)	1m 47s
build (3.3 / ubuntu-latest)	18s
build (3.3 / macos-latest)	15s
build (3.3 / windows-latest)	2m 38s
build (3.4 / ubuntu-latest)	15s
build (3.4 / macos-latest)	18s
build (3.4 / windows-latest)	4m 9s
build (head / ubuntu-latest)	18s
build (head / macos-latest)	16s
build (mingw / windows-latest)	1m 22s
build (mswin / windows-2019)	3m 12s
build (truffleruby-head / ubuntu-latest)	49s
	29m 55s

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