Append "_latest" to image id if no tag is present #2419

Job	Run time
No leftovers	2m 59s
CWL conformance (v1.0, docker)	6m 10s
Linters (lintreadme)	34s
CWL conformance (v1.0, singularity)	6m 25s
Tox (3, 9, lint)	33s
Linters (shellcheck)	13s
Tox (3, 9, unit)	5m 5s
CWL conformance (v1.0, podman)	6m 27s
Linters (pydocstyle)	15s
Tox (3, 9, bandit)	29s
CWL conformance (v1.1, docker)	7m 10s
Tox (3, 9, mypy)	6m 55s
CWL conformance (v1.1, singularity)	7m 23s
build_test_container	9m 47s
Tox (3, 10, lint)	29s
CWL conformance (v1.1, podman)	8m 12s
CWL conformance (v1.2, docker)	8m 48s
Test on macos-latest	4m 40s
CWL conformance (v1.2, singularity)	9m 15s
Tox (3, 10, unit)	4m 43s
CWL conformance (v1.2, podman)	8m 55s
Tox (3, 10, bandit)	21s
CWL conformance (v1.2, docker, --fast-parser)	8m 51s
cwltool release test	13m 4s
Tox (3, 10, mypy)	6m 41s
CWL conformance (v1.3.0-dev1, --relax-path-checks)	5m 46s
Tox (3, 11, lint)	23s
Tox (3, 11, unit)	4m 46s
Tox (3, 11, bandit)	24s
Tox (3, 11, mypy)	6m 34s
Tox (3, 12, lint)	26s
Tox (3, 12, unit)	6m 8s
Tox (3, 12, bandit)	24s
Tox (3, 12, mypy)	7m 16s
Tox (3, 13, lint)	33s
Tox (3, 13, unit)	6m 27s
Tox (3, 13, bandit)	37s
Tox (3, 13, mypy)	1m 6s
	2h 55m 14s

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