Merge pull request #58 from jaraco/feature/optional-env #19

Job	Run time
collateral (docs)	25s
test (3.8, ubuntu-latest)	30s
test (3.8, ubuntu-latest, optional)	36s
test (3.8, macos-latest)	58s
test (3.8, macos-latest, optional)	1m 6s
test (3.8, windows-latest)	1m 32s
test (3.8, windows-latest, optional)	2m 2s
test (3.11, ubuntu-latest)	29s
test (3.11, ubuntu-latest, optional)	39s
test (3.11, macos-latest)	54s
test (3.11, macos-latest, optional)	1m 38s
test (3.11, windows-latest)	1m 33s
test (3.11, windows-latest, optional)	2m 9s
test (3.12, ubuntu-latest)	46s
test (3.12, ubuntu-latest, optional)	1m 24s
test (3.12, macos-latest)	1m 10s
test (3.12, macos-latest, optional)	1m 21s
test (3.12, windows-latest)	2m 6s
test (3.12, windows-latest, optional)	2m 8s
test (3.9, ubuntu-latest)	27s
test (3.10, ubuntu-latest)	29s
test (pypy3.10, ubuntu-latest)	1m 59s
check	1s
release	0s
	26m 22s

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