Support executable templates #353

Job	Run time
spec (ruby 3.2) / spec	52s
spec (ruby 2.7) / spec	1m 13s
acceptance (ruby 3.2 \| windows-2019) / acceptance	40m 36s
acceptance (ruby 2.7 \| windows-2019) / acceptance	44m 7s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	12m 50s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	19m 27s
	1h 59m 5s

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