Support environments where pip is not installed #518

Job	Run time
Test with python 3.6 on windows-latest	1m 37s
Test with python 3.7 on windows-latest	1m 50s
Test with python 3.8 on windows-latest	9m 18s
Test with python 3.11 on windows-latest	9m 39s
Test with python 3.6 on macos-latest	1m 22s
Test with python 3.7 on macos-latest	2m 40s
Test with python 3.8 on macos-latest	3m 46s
Test with python 3.11 on macos-latest	7m 6s
Test with python 2.7 on ubuntu-20.04	33s
Test with python 3.6 on ubuntu-20.04	38s
Test with python 3.7 on ubuntu-latest	32s
Test with python 3.8 on ubuntu-latest	3m 45s
Test with python 3.9 on ubuntu-latest	3m 48s
Test with python 3.10 on ubuntu-latest	3m 38s
Test with python 3.11 on ubuntu-latest	3m 43s
	53m 55s

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