fix: version handling in protocol-testing

protocol-testing/build.rs

@@ -0,0 +1,15 @@
+use std::process::Command;
+
+fn hash() {
+    let output = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .unwrap();
+    let git_hash = String::from_utf8(output.stdout).unwrap();
+    println!("cargo:rustc-env=GIT_HASH={git_hash}");
+    println!("cargo:rerun-if-changed=.git/HEAD");
+}
+
+fn main() {
+    hash();
+}