Add option to use host paths in containers in addition to http URLs #98

Job	Run time
unit_tests (3.7)	38s
unit_tests (3.8)	29s
unit_tests (3.9)	32s
unit_tests (3.10)	36s
unit_tests (3.11)	36s
py_build_tests / py_build_tests	8s
py_build_tests / relative_path_tests	11s
	3m 10s

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