Check for dirty-files post-build #319

Job	Run time
test-fails-on-error	7s
test (ubuntu-latest, nightly)	42s
test (ubuntu-latest, lts)	19s
test-generate	3s
test (ubuntu-latest, lts-22.7, 9.6.4)	21s
test (ubuntu-latest, lts-12.26, 8.4.4)	17s
test (macOS-latest, nightly)	23s
test (macOS-latest, lts)	24s
test (macOS-latest, lts-22.7, 9.6.4)	22s
test (windows-latest, nightly)	2m 50s
test (windows-latest, lts)	1m 43s
test (windows-latest, lts-22.7, 9.6.4)	2m 9s
test (windows-latest, lts-12.26, 8.4.4)	1m 41s
test-stack-yamls (stack-nightly.yaml)	20s
test-stack-yamls (stack.yaml)	22s
	12m 3s

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