Add JRuby support for gem build and release #59

Job	Run time
build (gemfiles/Gemfile.activerecord-5.1, 2.4)	2m 24s
build (gemfiles/Gemfile.activerecord-6.0, 2.5)	2m 2s
build (gemfiles/Gemfile.activerecord-7.1, 2.7)	2m 8s
build (gemfiles/Gemfile.activerecord-6.1, 2.5)	2m 7s
build (gemfiles/Gemfile.activerecord-7.2, 3.1)	1m 43s
build (gemfiles/Gemfile.activerecord-5.2, 2.4)	2m 21s
build (gemfiles/Gemfile.activerecord-8.0, 3.2)	1m 54s
build (gemfiles/Gemfile.activerecord-7.0, 2.7)	2m 17s
build (gemfiles/Gemfile.activerecord-5.0, 2.4)	2m 30s
	19m 26s

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