Pass all environment variables to tox. #267

Job	Run time
lint	21s
python-3-10 (alpine, latest)	2m 25s
python-3-9 (alpine, latest)	1m 29s
python-3-10 (amazonlinux, latest)	2m 39s
python-3-9 (amazonlinux, latest)	1m 40s
python-3-10 (enterpriselinux, latest)	3m 16s
python-3-9 (enterpriselinux, latest)	2m 56s
python-3-10 (debian, latest)	3m 42s
python-3-9 (debian, latest)	2m 6s
python-3-10 (debian, bullseye)	3m 35s
python-3-9 (debian, bullseye)	2m 12s
python-3-10 (fedora, 39)	4m 30s
python-3-9 (fedora, 39)	2m 30s
python-3-10 (fedora, latest)	2m 46s
python-3-9 (fedora, latest)	2m 7s
python-3-10 (fedora, rawhide)	2m 33s
python-3-9 (fedora, rawhide)	1m 30s
python-3-10 (ubuntu, latest)	3m 43s
python-3-9 (ubuntu, latest)	1m 54s
python-3-10 (ubuntu, jammy)	3m 35s
python-3-10 (ubuntu, focal)	4m 26s
python-3-9 (ubuntu, jammy)	2m 41s
python-3-9 (ubuntu, focal)	2m 28s
	1h 1m 4s

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