Do not require docker save #663

Job	Run time
cwl-utils release test	2m 50s
CI linters via Tox (lint-readme)	28s
CI linters via Tox (pydocstyle)	28s
CI tests via Tox (3, 8, lint)	33s
CI tests via Tox (3, 8, unit)	35s
CI tests via Tox (3, 8, bandit)	43s
CI tests via Tox (3, 8, mypy)	44s
CI tests via Tox (3, 9, lint)	31s
CI tests via Tox (3, 9, unit)	1s
CI tests via Tox (3, 9, bandit)	43s
CI tests via Tox (3, 9, mypy)	1s
CI tests via Tox (3, 10, lint)	37s
CI tests via Tox (3, 10, unit)	47s
CI tests via Tox (3, 10, bandit)	40s
CI tests via Tox (3, 10, mypy)	49s
CI tests via Tox (3, 11, lint)	29s
CI tests via Tox (3, 11, unit)	45s
CI tests via Tox (3, 11, bandit)	33s
CI tests via Tox (3, 11, mypy)	47s
CI tests via Tox (3, 12, lint)	41s
CI tests via Tox (3, 12, unit)	33s
CI tests via Tox (3, 12, bandit)	45s
CI tests via Tox (3, 12, mypy)	32s
	15m 35s

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