fix: limit db pool to 1 in tests

src/settings/mod.rs

@@ -150,6 +150,7 @@ pub mod tests {
         let mut db_url = Url::parse(&settings.database.url).unwrap();
         db_url.set_path(&GenerateRandomString.get_random(12));
         settings.database.url = db_url.to_string();
+        settings.database.pool = 1;
 
         settings
     }