test: verify env file is POSIX-compatible (dash) #7335

Job	Run time
optimize-ci	4s
detect-changes	7s
download-previous-rolldown-binaries	12s
Lint	46s
Test (windows-latest, x86_64-pc-windows-msvc)	3m 47s
Test (namespace-profile-mac-default, aarch64-apple-darwin)	1m 4s
Test (Linux x64 musl)	2m 41s
Test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	1m 21s
CLI E2E test (Linux x64 musl)	3m 12s
CLI E2E test (namespace-profile-mac-default, aarch64-apple-darwin)	1m 8s
CLI E2E test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	1m 10s
CLI E2E test (windows-latest, x86_64-pc-windows-msvc)	9m 57s
CLI snap test (aarch64-apple-darwin, 2/3)	1m 35s
CLI snap test (aarch64-apple-darwin, 3/3)	1m 49s
CLI snap test (x86_64-pc-windows-msvc, 1/3)	9m 34s
CLI snap test (aarch64-apple-darwin, 1/3)	1m 17s
CLI snap test (x86_64-unknown-linux-gnu, 3/3)	1m 54s
CLI snap test (x86_64-pc-windows-msvc, 3/3)	10m 27s
CLI snap test (x86_64-unknown-linux-gnu, 1/3)	1m 29s
CLI snap test (x86_64-unknown-linux-gnu, 2/3)	1m 48s
CLI snap test (x86_64-pc-windows-msvc, 2/3)	10m 16s
Local CLI `vp install` E2E test	0s
done	2s
	1h 5m 40s

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