Pass all environment variables to tox. #241

Job	Run time
lint	26s
python-3-10 (enterpriselinux, latest)	3m 11s
python-3-10 (debian, latest)	3m 26s
python-3-9 (enterpriselinux, latest)	2m 16s
python-3-10 (debian, bullseye)	3m 29s
python-3-9 (debian, latest)	2m 12s
python-3-10 (fedora, 39)	5m 6s
python-3-10 (fedora, latest)	3m 23s
python-3-10 (fedora, rawhide)	3m 4s
python-3-9 (debian, bullseye)	2m 7s
python-3-10 (ubuntu, latest)	3m 39s
python-3-9 (fedora, 39)	2m 40s
python-3-10 (ubuntu, jammy)	3m 11s
python-3-9 (fedora, latest)	2m 5s
python-3-10 (ubuntu, focal)	3m 39s
python-3-9 (fedora, rawhide)	2m 9s
python-3-9 (ubuntu, latest)	2m 10s
python-3-9 (ubuntu, jammy)	2m 18s
python-3-9 (ubuntu, focal)	2m 13s
	52m 44s

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