Support executable templates #356

Job	Run time
spec (ruby 3.2) / spec	37s
spec (ruby 2.7) / spec	50s
acceptance (ruby 2.7 \| windows-2019) / acceptance	44m 35s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	19m 10s
acceptance (ruby 3.2 \| windows-2019) / acceptance	1h 4m 4s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	12m 59s
	2h 22m 15s

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