Support environments where pip is not installed #517

Job	Run time
Test with python 3.6 on windows-latest	1m 50s
Test with python 3.7 on windows-latest	1m 3s
Test with python 3.8 on windows-latest	3m 43s
Test with python 3.11 on windows-latest	3m 45s
Test with python 3.6 on macos-latest	3m 10s
Test with python 3.7 on macos-latest	1m 8s
Test with python 3.8 on macos-latest	3m 32s
Test with python 3.11 on macos-latest	3m 36s
Test with python 2.7 on ubuntu-20.04	32s
Test with python 3.6 on ubuntu-20.04	36s
Test with python 3.7 on ubuntu-latest	32s
Test with python 3.8 on ubuntu-latest	3m 35s
Test with python 3.9 on ubuntu-latest	3m 44s
Test with python 3.10 on ubuntu-latest	3m 40s
Test with python 3.11 on ubuntu-latest	3m 42s
	38m 8s

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