Add support for unit testing via Unix OS #715

Job	Run time
spec (ruby 2.7 \| puppet ~> 7.0) / spec	1m 36s
spec (ruby 3.2 \| puppet ~> 8.0) / spec	1m 29s
acceptance (windows-latest ruby 3.2 \| puppet ~> 8.0) / acceptance	7m 46s
acceptance (windows-latest ruby 2.7 \| puppet ~> 7.0) / acceptance	8m 7s
	18m 58s

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