Begin to add a test parachain

test/parachain/build.rs

@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}