Do not require docker save #666

Job	Run time
CI linters via Tox (lint-readme)	33s
cwl-utils release test	2m 38s
CI tests via Tox (3, 8, lint)	26s
CI tests via Tox (3, 8, unit)	1m 2s
CI linters via Tox (pydocstyle)	21s
CI tests via Tox (3, 8, bandit)	47s
CI tests via Tox (3, 8, mypy)	47s
CI tests via Tox (3, 9, lint)	30s
CI tests via Tox (3, 9, unit)	19s
CI tests via Tox (3, 9, bandit)	42s
CI tests via Tox (3, 9, mypy)	18s
CI tests via Tox (3, 10, lint)	33s
CI tests via Tox (3, 10, unit)	1m 5s
CI tests via Tox (3, 10, bandit)	47s
CI tests via Tox (3, 10, mypy)	49s
CI tests via Tox (3, 11, lint)	40s
CI tests via Tox (3, 11, unit)	1m 3s
CI tests via Tox (3, 11, bandit)	42s
CI tests via Tox (3, 11, mypy)	57s
CI tests via Tox (3, 12, lint)	44s
CI tests via Tox (3, 12, unit)	1m 5s
CI tests via Tox (3, 12, bandit)	51s
CI tests via Tox (3, 12, mypy)	1m 4s
	18m 43s

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