Add option to use host paths in containers in addition to http URLs #96

Job	Run time
unit_tests (3.7)	32s
unit_tests (3.8)	35s
unit_tests (3.9)	33s
unit_tests (3.10)	42s
unit_tests (3.11)	27s
py_build_tests / py_build_tests	10s
py_build_tests / relative_path_tests	8s
	3m 7s

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