feat(tvix/cli): implement builtins.derivation

This uses the actual upstream Nix code for
`builtins.derivation` (which is not a primop in C++ Nix) to implement
`builtins.derivation` as a wrapper around `builtins.derivationStrict`.

We're doing it this way to ensure that our thunking logic is correct.
An initial Rust-native rewrite (see e.g. cl/7363) is pretty difficult
to debug while there are still other issues to root out, but
eventually we might want to turn this into native code.

Change-Id: I5845e18073e103b8670e40648bd7fd9b511058e0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7902
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/cli/src/main.rs

@@ -60,6 +60,10 @@ fn interpret(code: &str, path: Option<PathBuf>, args: &Args, explain: bool) -> b
     eval.builtins
         .extend(derivation::derivation_builtins(known_paths));
 
+    // Add the actual `builtins.derivation` from compiled Nix code
+    eval.src_builtins
+        .push(("derivation", include_str!("derivation.nix")));
+
     let source_map = eval.source_map();
     let result = {
         let mut compiler_observer =