fix script

lib.nix

@@ -108,10 +108,7 @@ in
           )
         );
       };
-      setupScript = pkgs.writeShellApplication {
-        runtimeInputs = [ pkgs.makeWrapper ];
-        name = "setup-postgres";
-        text = ''
+      setupScript = pkgs.writeShellScriptBin "setup-postgres" ''
         set -euo pipefail
         export PATH=${package}/bin:${pkgs.coreutils}/bin
         POSTGRES_RUN_INITIAL_SCRIPT="false"
@@ -122,8 +119,7 @@ in
           echo "PostgreSQL initdb process completed"
           echo
         fi
-          substituteAllInPlace "$PGDATA"/postgresql.conf
-          cp ${configFile} "$PGDATA"/postgresql.conf
+        sed "s|@PGHOST|''${PGHOST}|g" ${configFile} > "$PGDATA"/postgresql.conf
         if [[ "$POSTGRES_RUN_INITIAL_SCRIPT" == "true" ]]; then
           echo
           echo "PostgreSQL is setting up the initial database"
@@ -138,7 +134,6 @@ in
 
         unset POSTGRES_RUN_INITIAL_SCRIPT
       '';
-      };
 
       script = pkgs.writeShellApplication {
         name = "run-postgres";