lets try that again

machines/oracles.nix

@@ -88,8 +88,16 @@
         monthly = -1; # Keep unlimited monthly backups
       };
     };
-    postgres = {
+    postgres =
-      dumpCommand = "su postgres -c pg_dumpall";
+      let dumper = pkgs.writeScript "pg-dumper"
+        ''
+          #!/usr/bin/env bash
+          su -c postgres pg_dumpall
+        '';
+      in
+      {
+
+        dumpCommand = dumper;
         repo = "de1955@de1955.rsync.net:databases/oracles/postgres";
         encryption = {
           mode = "repokey-blake2";