tox: set a $HOME value, helps conda install #1831

Job	Run time
Tox (3, 8, lint)	42s
CWL conformance (v1.0, docker)	7m 59s
Tox (3, 8, unit)	12m 11s
Linters (lintreadme)	1m 57s
CWL conformance (v1.0, singularity)	7m 48s
Linters (shellcheck)	31s
Tox (3, 8, bandit)	37s
Linters (pydocstyle)	33s
Tox (3, 8, mypy)	9m 51s
CWL conformance (v1.0, podman)	6m 10s
Tox (3, 9, lint)	33s
CWL conformance (v1.1, docker)	10m 1s
Tox (3, 9, unit)	10m 12s
CWL conformance (v1.1, singularity)	11m 44s
Tox (3, 9, bandit)	40s
build_test_container	12m 27s
CWL conformance (v1.1, podman)	10m 45s
Tox (3, 9, mypy)	13m 2s
CWL conformance (v1.2, docker)	13m 32s
Tox (3, 10, lint)	39s
CWL conformance (v1.2, singularity)	15m 40s
Tox (3, 10, unit)	9m 2s
Tox (3, 10, bandit)	34s
CWL conformance (v1.2, podman)	14m 20s
CWL conformance (v1.2, docker, --fast-parser)	10m 23s
Tox (3, 10, mypy)	10m 50s
Test on macos-latest	10m 22s
Tox (3, 11, lint)	36s
cwltool release test	13m 13s
Tox (3, 11, unit)	12m 2s
Tox (3, 11, bandit)	38s
Tox (3, 11, mypy)	10m 39s
Tox (3, 12, lint)	52s
No leftovers	6m 55s
Tox (3, 12, unit)	12m 59s
Tox (3, 12, bandit)	55s
Tox (3, 12, mypy)	12m 44s
	4h 34m 38s

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