fix: Run cargo metadata with no-deps flag (#211)

This is an attempt to restore the old behaviour of ``cargo chef prepare``
which would finish quickly and not need Git credentials for private repos.

Co-authored-by: Alex Silva <alex.silva@btcx.com>

src/skeleton/mod.rs

@@ -340,6 +340,7 @@ fn serialize_manifests(manifests: Vec<ParsedManifest>) -> Result<Vec<Manifest>,
 fn extract_cargo_metadata(path: &Path) -> Result<cargo_metadata::Metadata, anyhow::Error> {
     let mut cmd = cargo_metadata::MetadataCommand::new();
     cmd.current_dir(path);
+    cmd.no_deps();
 
     cmd.exec().context("Cannot extract Cargo metadata")
 }