Improve test for env variables (#2409) #8315

Job	Run time
build-linux-musl (nightly)	9m 20s
build-apple-x86 (nightly)	1m 38s
build-linux-musl (stable)	3m 39s
build-apple-x86 (stable)	2m 20s
build-linux-musl (1.70)	9m 3s
build-linux-arm (nightly)	7m 20s
build-apple-x86 (1.70)	3m 32s
build (ubuntu-latest, nightly)	3m 0s
build-linux-arm (stable)	6m 48s
build (ubuntu-latest, stable)	1m 48s
build-linux-arm (1.70)	9m 9s
Lints	37s
build (ubuntu-latest, 1.70)	2m 16s
Changelog Test	4s
build (macos-latest, nightly)	2m 5s
udeps	2m 11s
build (macos-latest, stable)	2m 2s
build (macos-latest, 1.70)	1m 57s
build (windows-latest, nightly)	5m 39s
build (windows-latest, stable)	5m 38s
build (windows-latest, 1.70)	7m 33s
	1h 27m 39s

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