Testing dir2cast

Add working dockerfile and update readme #234

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Run time

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Job	Run time
build (ubuntu-latest, 7.3)	47s
build (ubuntu-latest, 7.4)	44s
build (ubuntu-latest, 8.0)	51s
build (ubuntu-latest, 8.1)	44s
build (ubuntu-latest, 8.2)	47s
build (macos-11, 7.3)	1h 19m 47s
build (macos-11, 7.4)	3h 0m 10s
build (macos-11, 8.0)	3h 5m 54s
build (macos-11, 8.1)	3h 25m 46s
build (macos-11, 8.2)	3h 6m 49s
	14h 2m 19s