fix(test): make sure search_path includes required schemas for pgmq

Author: jfroche

nix/ext/tests/pgmq.nix

@@ -47,7 +47,13 @@ self.inputs.nixpkgs.lib.nixos.runTest {
       services.postgresql = {
         enable = true;
         package = (postgresqlWithExtension psql_15);
-        settings = (installedExtension "15").defaultSettings or { };
+        settings = {
+          search_path = "\"$user\", public, auth, extensions";
+        };
+        initialScript = pkgs.writeText "postgres-init.sql" ''
+          CREATE SCHEMA auth;
+          CREATE SCHEMA extensions;
+        '';
       };
 
       specialisation.postgresql17.configuration = {