allow overriding listen addr using env variable #6134

Job	Run time
Build Spin Ubuntu	21m 26s
all-integration-tests	27m 54s
Build Spin static (aarch64, aarch64-unknown-linux-musl)	16m 31s
Build Spin (windows-latest)	28m 2s
Build Spin static (amd64, x86_64-unknown-linux-musl)	15m 53s
Build Spin (macos-13)	34m 25s
Review new dependencies for known vulnerabilities	4s
Run release build steps (ubuntu-20.04, amd64, --features openssl/vendored, target/release)	15m 58s
Build Spin (macos-14)	22m 20s
Lint Rust	9m 39s
Run release build steps (ubuntu-20.04, aarch64, --features openssl/vendored --target aarch64-unkn...	16m 16s
Test Spin (ubuntu-22.04-4core-spin)	8m 19s
Run release build steps (macos-13, amd64, target/release)	22m 37s
Test Spin (macos-14)	1h 18m 55s
Run release build steps (macos-14, aarch64, target/release)	12m 20s
Run release build steps (windows-latest, amd64, .exe, target/release)	29m 6s
	5h 59m 45s

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