fix setup script

lib.nix

@@ -108,7 +108,7 @@ in
           )
         );
       };
-      setupScript = pkgs.writeShellScript "setup-postgres" ''
+      setupScript = pkgs.writeShellScriptBin "setup-postgres" ''
         set -euo pipefail
         export PATH=${package}/bin:${pkgs.coreutils}/bin
         POSTGRES_RUN_INITIAL_SCRIPT="false"
@@ -137,7 +137,7 @@ in
           set -euo pipefail
           mkdir -p ${lib.escapeShellArg data_dir}
           ${setupScript}/bin/setup-postgres
-          ${package}/bin/postgres -D${data_dir} --config-file=${configFile}
+          exec ${package}/bin/postgres -D${data_dir} 
         '';
       };
     in