Add Nix support to language tests #65

Job	Run time
rustfmt	15s
lint-build	57s
test-flake (x86_64-unknown-linux-gnu)	2m 8s
test (stable, x86_64-unknown-linux-gnu)	2m 9s
test-wasm	1m 14s
test (stable, x86_64-unknown-linux-musl)	1m 55s
test (stable, aarch64-unknown-linux-gnu)	1m 57s
test-flake (x86_64-unknown-linux-musl)	2m 11s
test (stable, aarch64-unknown-linux-musl)	1m 55s
test-flake (aarch64-unknown-linux-gnu)	2m 9s
test (stable, x86_64-apple-darwin)	1m 57s
test-flake (aarch64-unknown-linux-musl)	2m 11s
test (stable, x86_64-pc-windows-msvc)	1m 52s
test-flake (x86_64-apple-darwin)	2m 10s
test (stable, aarch64-apple-darwin, macos-latest, false, true, true)	1m 56s
test-flake (aarch64-apple-darwin, macos-14)	2m 9s
test-projects	1m 4s
	30m 9s

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