fix(cli): made cargo metadata invocation use given cargo path

This allows users to actually not have `cargo` installed at all, and
just provide a binary path, without having to set `$CARGO` etc.

Author: arctic-hen7

packages/perseus-cli/src/install.rs

@@ -96,6 +96,7 @@ impl Tools {
         // right version of `wasm-bindgen`
         let metadata = MetadataCommand::new()
             .no_deps()
+            .cargo_path(&global_opts.cargo_engine_path)
             .exec()
             .map_err(|err| InstallError::MetadataFailed { source: err })?;
         let workspace_root = metadata.workspace_root.into_std_path_buf();