Merge pull request #591 from AlexWayfer/exclude_ci_files_from_built_gem #674

Job	Run time
Build	7s
Test (windows, head, 16.0-1-windows-x64, 16)	2m 43s
Test (windows, 2.5, 9.4.26-1-windows-x64, 9.4)	5m 46s
Test (windows, mswin, 16.0-1-windows-x64, 16)	1m 47s
Test (ubuntu, head, 16)	1m 6s
Test (ubuntu, 3.2, 12)	1m 7s
Test (ubuntu, 20.04, 2.5, 9.3)	1m 30s
Test (ubuntu, truffleruby, 13)	1m 29s
Test (ubuntu, truffleruby-head, 16)	1m 46s
Test (macos, head, 16.0-1-osx, 16)	1m 18s
	18m 39s

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