Make CI runnable for any push #27

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	42s
test (2.5, macos-latest)	1m 46s
test (2.5, windows-latest)	3m 19s
test (2.6, ubuntu-latest)	45s
test (2.6, macos-latest)	1m 11s
test (2.6, windows-latest)	2m 39s
test (2.7, ubuntu-latest)	38s
test (2.7, macos-latest)	57s
test (2.7, windows-latest)	2m 1s
test (3.0, ubuntu-latest)	21s
test (3.0, macos-latest)	28s
test (3.0, windows-latest)	1m 45s
test (3.1, ubuntu-latest)	24s
test (3.1, macos-latest)	36s
test (3.1, windows-latest)	1m 53s
test (3.2, ubuntu-latest)	30s
test (3.2, macos-latest)	36s
test (3.2, windows-latest)	3m 58s
test (head, ubuntu-latest)	29s
test (head, macos-latest)	42s
test (head, windows-latest)	1m 53s
test (jruby, ubuntu-latest)	7m 3s
test (jruby-head, ubuntu-latest)	6m 27s
test (truffleruby, ubuntu-latest)	2m 57s
test (truffleruby-head, ubuntu-latest)	2m 43s
	46m 47s

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