add test for scatter in loop (#1965) #6

Job	Run time
No leftovers	4m 57s
build_test_container	9m 43s
Test on macos-latest	13m 19s
CWL conformance (v1.0, docker)	7m 13s
CWL conformance (v1.0, singularity)	7m 23s
cwltool release test	17m 4s
CWL conformance (v1.0, podman)	9m 0s
Tox (3, 8, lint)	31s
CWL conformance (v1.1, docker)	9m 18s
Linters (lintreadme)	46s
Tox (3, 8, unit)	7m 7s
CWL conformance (v1.1, singularity)	9m 45s
Tox (3, 8, bandit)	36s
Linters (shellcheck)	12s
CWL conformance (v1.1, podman)	9m 10s
Tox (3, 8, mypy)	8m 46s
Linters (pydocstyle)	20s
CWL conformance (v1.2, docker)	11m 27s
CWL conformance (v1.2, singularity)	11m 21s
CWL conformance (v1.2, podman)	11m 40s
Tox (3, 9, lint)	36s
CWL conformance (v1.2, docker, --fast-parser)	11m 30s
Tox (3, 9, unit)	7m 53s
Tox (3, 9, bandit)	26s
Tox (3, 9, mypy)	10m 16s
Tox (3, 10, lint)	45s
Tox (3, 10, unit)	8m 53s
Tox (3, 10, bandit)	44s
Tox (3, 10, mypy)	8m 54s
Tox (3, 11, lint)	25s
Tox (3, 11, unit)	8m 21s
Tox (3, 11, bandit)	22s
Tox (3, 11, mypy)	9m 24s
Tox (3, 12, lint)	30s
Tox (3, 12, unit)	10m 23s
Tox (3, 12, bandit)	30s
Tox (3, 12, mypy)	8m 28s
	3h 57m 58s

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