Pass all environment variables to tox. #366

Job	Run time
lint	26s
python-3-10 (alpine, latest)	2m 25s
python-3-9 (alpine, latest)	1m 27s
python-3-10 (amazonlinux, latest)	2m 28s
python-3-9 (amazonlinux, latest)	1m 42s
python-3-10 (enterpriselinux, latest)	2m 20s
python-3-9 (enterpriselinux, latest)	1m 23s
python-3-10 (debian, latest)	2m 39s
python-3-10 (debian, bullseye)	2m 39s
python-3-9 (debian, latest)	1m 49s
python-3-9 (debian, bullseye)	1m 54s
python-3-10 (fedora, 39)	3m 43s
python-3-9 (fedora, 39)	2m 2s
python-3-10 (fedora, latest)	2m 37s
python-3-10 (fedora, rawhide)	2m 31s
python-3-9 (fedora, latest)	1m 48s
python-3-10 (ubuntu, latest)	3m 23s
python-3-9 (fedora, rawhide)	1m 42s
python-3-10 (ubuntu, jammy)	3m 17s
python-3-9 (ubuntu, latest)	1m 58s
python-3-10 (ubuntu, focal)	3m 22s
python-3-9 (ubuntu, jammy)	2m 16s
python-3-9 (ubuntu, focal)	1m 52s
	51m 43s

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