Pass all environment variables to tox. #223

Job	Run time
lint	22s
python-3-9 (alpine, latest)	1m 52s
python-3-10 (alpine, latest)	2m 38s
python-3-9 (amazonlinux, latest)	1m 43s
python-3-10 (amazonlinux, latest)	2m 20s
python-3-9 (enterpriselinux, latest)	1m 35s
python-3-10 (enterpriselinux, latest)	2m 39s
python-3-9 (debian, latest)	2m 10s
python-3-10 (debian, latest)	3m 5s
python-3-9 (debian, bullseye)	1m 49s
python-3-10 (debian, bullseye)	2m 52s
python-3-9 (fedora, 39)	2m 26s
python-3-10 (fedora, 39)	4m 1s
python-3-9 (fedora, latest)	1m 50s
python-3-10 (fedora, latest)	3m 34s
python-3-9 (fedora, rawhide)	1m 59s
python-3-10 (fedora, rawhide)	3m 2s
python-3-9 (ubuntu, latest)	1m 47s
python-3-10 (ubuntu, latest)	3m 26s
python-3-9 (ubuntu, jammy)	2m 5s
python-3-10 (ubuntu, jammy)	3m 37s
python-3-9 (ubuntu, focal)	1m 59s
python-3-10 (ubuntu, focal)	3m 44s
	56m 35s

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