chore: Enable Ad Hoc signing on macOS (#1117)

Closes #1116

src-tauri/tauri.macos.conf.json

@@ -12,7 +12,7 @@
         "frameworks": [],
         "minimumSystemVersion": "10.15",
         "exceptionDomain": "",
-        "signingIdentity": null,
+        "signingIdentity": "-",
         "entitlements": null
       }
     }