Add option to use host paths in containers in addition to http URLs #93

Job	Run time
unit_tests (3.7)	40s
unit_tests (3.8)	43s
unit_tests (3.9)	35s
unit_tests (3.10)	41s
unit_tests (3.11)	37s
py_build_tests / py_build_tests	11s
py_build_tests / relative_path_tests	9s
	3m 36s

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