feat: add build sha to parser.c header comment

cli/generate/build.rs

@@ -0,0 +1,32 @@
+use std::{env, path::PathBuf, process::Command};
+
+fn main() {
+    if let Some(git_sha) = read_git_sha() {
+        println!("cargo:rustc-env=BUILD_SHA={git_sha}");
+    }
+}
+
+// This is copied from the build.rs in parent directory. This should be updated if the
+// parent build.rs gets fixes.
+fn read_git_sha() -> Option<String> {
+    let crate_path = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+
+    if !crate_path
+        .parent()?
+        .parent()
+        .map_or(false, |p| p.join(".git").is_dir())
+    {
+        return None;
+    }
+
+    Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .current_dir(crate_path)
+        .output()
+        .map_or(None, |output| {
+            if !output.status.success() {
+                return None;
+            }
+            Some(String::from_utf8_lossy(&output.stdout).to_string())
+        })
+}