pathmapper: don't use temporary lists #1923

Job	Run time
No leftovers	4m 36s
CWL conformance (v1.0, docker)	3m 29s
cwltool release test	16m 56s
CWL conformance (v1.0, singularity)	3m 16s
Tox (3, 8, lint)	28s
CWL conformance (v1.0, podman)	3m 31s
Tox (3, 8, unit)	6m 27s
Linters (lintreadme)	50s
CWL conformance (v1.1, docker)	4m 46s
Linters (shellcheck)	17s
Tox (3, 8, bandit)	24s
CWL conformance (v1.1, singularity)	5m 40s
Tox (3, 8, mypy)	9m 16s
Linters (pydocstyle)	18s
CWL conformance (v1.1, podman)	4m 58s
build_test_container	9m 20s
Tox (3, 9, lint)	27s
CWL conformance (v1.2, docker)	6m 7s
Tox (3, 9, unit)	6m 27s
CWL conformance (v1.2, singularity)	7m 9s
CWL conformance (v1.2, podman)	6m 36s
Tox (3, 9, bandit)	38s
CWL conformance (v1.2, docker, --fast-parser)	6m 21s
Test on macos-latest	7m 16s
Tox (3, 9, mypy)	8m 42s
Tox (3, 10, lint)	25s
Tox (3, 10, unit)	6m 31s
Tox (3, 10, bandit)	28s
Tox (3, 10, mypy)	7m 45s
Tox (3, 11, lint)	25s
Tox (3, 11, unit)	7m 2s
Tox (3, 11, bandit)	23s
Tox (3, 11, mypy)	7m 7s
Tox (3, 12, lint)	32s
Tox (3, 12, unit)	7m 50s
Tox (3, 12, bandit)	34s
Tox (3, 12, mypy)	7m 43s
	2h 51m 0s

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