Add Nix support to language tests #66

Job	Run time
test-flake (x86_64-unknown-linux-gnu)	10m 59s
test-flake (x86_64-unknown-linux-musl)	10m 48s
lint-build	2m 10s
test-flake (aarch64-unknown-linux-gnu)	10m 49s
test (stable, x86_64-unknown-linux-gnu)	4m 48s
rustfmt	15s
test (stable, x86_64-unknown-linux-musl)	6m 10s
test-flake (aarch64-unknown-linux-musl)	10m 42s
test-wasm	1m 16s
test (stable, aarch64-unknown-linux-gnu)	3m 44s
test-flake (x86_64-apple-darwin)	13m 3s
test (stable, aarch64-unknown-linux-musl)	4m 3s
test-flake (aarch64-apple-darwin, macos-14)	7m 13s
test (stable, x86_64-apple-darwin)	10m 1s
test (stable, x86_64-pc-windows-msvc)	7m 59s
test (stable, aarch64-apple-darwin, macos-latest, false, true, true)	4m 35s
test-projects	1m 35s
	1h 50m 10s

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