Fixed another symlinking issue with Docker + staged files from InitialWorkDirRequirement #1935

Job	Run time
No leftovers	4m 30s
cwltool release test	18m 19s
CWL conformance (v1.0, docker)	3m 30s
build_test_container	9m 34s
CWL conformance (v1.0, singularity)	3m 27s
Tox (3, 8, lint)	36s
CWL conformance (v1.0, podman)	3m 59s
Linters (lintreadme)	53s
Tox (3, 8, unit)	6m 30s
Linters (shellcheck)	22s
Linters (pydocstyle)	20s
Tox (3, 8, bandit)	31s
CWL conformance (v1.1, docker)	4m 53s
Tox (3, 8, mypy)	8m 3s
CWL conformance (v1.1, singularity)	6m 18s
Tox (3, 9, lint)	31s
CWL conformance (v1.1, podman)	5m 20s
Tox (3, 9, unit)	8m 5s
CWL conformance (v1.2, docker)	7m 2s
Test on macos-latest	5m 36s
Tox (3, 9, bandit)	24s
CWL conformance (v1.2, singularity)	6m 56s
Tox (3, 9, mypy)	8m 54s
CWL conformance (v1.2, podman)	7m 9s
Tox (3, 10, lint)	28s
CWL conformance (v1.2, docker, --fast-parser)	6m 53s
Tox (3, 10, unit)	6m 35s
Tox (3, 10, bandit)	28s
Tox (3, 10, mypy)	7m 51s
Tox (3, 11, lint)	29s
Tox (3, 11, unit)	7m 0s
Tox (3, 11, bandit)	31s
Tox (3, 11, mypy)	9m 4s
Tox (3, 12, lint)	37s
Tox (3, 12, unit)	8m 2s
Tox (3, 12, bandit)	26s
Tox (3, 12, mypy)	8m 31s
	2h 58m 37s

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