Add option to use host paths in containers in addition to http URLs #95

Job	Run time
unit_tests (3.7)	39s
unit_tests (3.8)	32s
unit_tests (3.9)	31s
unit_tests (3.10)	45s
unit_tests (3.11)	38s
py_build_tests / py_build_tests	12s
py_build_tests / relative_path_tests	7s
	3m 24s

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