Support executable templates #359

Job	Run time
spec (ruby 2.7) / spec	55s
spec (ruby 3.2) / spec	43s
acceptance (ruby 3.2 \| windows-2019) / acceptance	41m 16s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	12m 29s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	14m 14s
acceptance (ruby 2.7 \| windows-2019) / acceptance	28m 47s
	1h 38m 24s

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