chore: add build.rs

build.rs

@@ -0,0 +1,11 @@
+use std::process::Command;
+
+fn main() {
+    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);
+    let date_output = Command::new("date").args(&["+%Y-%m-%dT%H:%M:%S%z"]).output().unwrap();
+    let date = String::from_utf8(date_output.stdout).unwrap();
+    println!("cargo:rustc-env=BUILD_DATE={}", date);
+}
+