If there is an error, stop the signing process.

cmake/sign_dmg.py

@@ -39,6 +39,7 @@ def sign_dmg(input_dmg, output_dmg, signing_identity):
         exit(1)
 
     # Sign the .app bundle
+    try:
         subprocess.run([
             'codesign',
             '--deep',
@@ -48,7 +49,13 @@ def sign_dmg(input_dmg, output_dmg, signing_identity):
             '--timestamp',
             '--sign', signing_identity,
             app_bundle
-    ])
+        ], check=True)
+    except subprocess.CalledProcessError as e:
+        print(f"Error during codesign: {e}")
+        # Clean up temporary directories
+        shutil.rmtree(temp_dir)
+        shutil.rmtree(mount_point)
+        exit(1)
 
     # Create a new DMG containing the signed .app bundle
     subprocess.run([