fix caching issue

build.rs

@@ -7,7 +7,7 @@ fn main() {
     // absolute paths.
     #[allow(clippy::eq_op)]
     let is_public =
-        env!("CARGO_PKG_REPOSITORY") == "https://github.com/worldcoin/orb-messages";
+        std::env::var("CARGO_PKG_REPOSITORY").unwrap() == "https://github.com/worldcoin/orb-messages";
     let (messages_dir, priv_dir) = if is_public {
         println!("cargo:warning=Be aware that private definitions are stubbed out when building the public crate.");
 
@@ -18,7 +18,6 @@ fn main() {
 
     // rebuild if any of this changes
     println!("cargo:rerun-if-env-changed=PROTOC");
-    println!("cargo:rerun-if-env-changed=build.rs");
     println!("cargo:rerun-if-env-changed=PROTOC_INCLUDE");
     println!("cargo:rerun-if-changed={}", messages_dir.display());
     println!("cargo:rerun-if-changed={}", priv_dir.display());