Add Nix support to language tests #62

Job	Run time
rustfmt	18s
lint-build	48s
test-flake (x86_64-unknown-linux-gnu)	10m 9s
test (stable, x86_64-unknown-linux-gnu)	3m 17s
test-flake (x86_64-unknown-linux-musl)	9m 47s
test-wasm	1m 14s
test (stable, x86_64-unknown-linux-musl)	6m 19s
test-flake (aarch64-unknown-linux-gnu)	9m 58s
test (stable, aarch64-unknown-linux-gnu)	2m 11s
test-flake (aarch64-unknown-linux-musl)	10m 9s
test (stable, aarch64-unknown-linux-musl)	2m 23s
test-flake (x86_64-apple-darwin)	9m 31s
test (stable, x86_64-apple-darwin)	5m 50s
test-flake (aarch64-apple-darwin, macos-14)	7m 28s
test (stable, x86_64-pc-windows-msvc)	8m 20s
test (stable, aarch64-apple-darwin, macos-latest, false, true, true)	3m 54s
test-projects	1m 50s
	1h 33m 26s

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