Add JRuby rake CI task #2524

Job	Run time
build (ubuntu-latest)	36s
build (macos-latest)	1m 9s
build (windows-latest)	5m 17s
build-debug-mode (ubuntu-latest)	29s
build-debug-mode (macos-latest)	1m 7s
build-debug-mode (windows-latest)	2m 58s
build-jruby	58s
build-without-assertions (ubuntu-20.04)	25s
build-without-assertions (ubuntu-22.04)	23s
gem-package	8s
lex-discourse	1m 17s
lex-ruby	2m 41s
lex-top-100	6m 21s
memcheck	6m 33s
gem-install (3.2, ubuntu-latest)	27s
gem-install (3.2, macos-latest)	51s
gem-install (3.2, windows-latest)	3m 54s
gem-install (head, ubuntu-latest)	1m 42s
gem-install (head, macos-latest)	3m 3s
gem-install (head, windows-latest)	15m 22s
	55m 41s

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