Testing dir2cast

Add working dockerfile and update readme #230

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Run time

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Job	Run time
build (ubuntu-latest, 7.3)	56s
build (ubuntu-latest, 7.4)	44s
build (ubuntu-latest, 8.0)	48s
build (ubuntu-latest, 8.1)	45s
build (ubuntu-latest, 8.2)	49s
build (macos-11, 7.3)	1h 20m 53s
build (macos-11, 7.4)	5h 2m 43s
build (macos-11, 8.0)	4h 54m 42s
build (macos-11, 8.1)	3h 7m 40s
build (macos-11, 8.2)	3h 9m 0s
	17h 39m 0s