feat(pm/teal): Make auto-update service for patisserie

Tangled.sh doesn't currently support cron tasks so we will use this as a
stopgap until it does

packetmix/systems/teal/patisserie-autoupdate.nix

···
+{ pkgs }: {
+  systemd.services."patisserie-autoupdate" = {
+    startAt = "00:00:00";
+    script = let
+      jj = "${pkgs.jujutsu}/bin/jj";
+      npins = "${pkgs.npins}/bin/npins";
+    in ''
+      GIT_SSH_COMMAND="ssh -i /etc/ssh/ssh_host_ed25519_key"
+      ${jj} git fetch
+      ${jj} new main@origin
+      ${npins} update
+      ${jj} desc -m "chore(packetmix): Auto update packages"
+      ${jj} bookmark s auto/npins-update
+      ${jj} git push --force
+    '';
+    serviceConfig.WorkingDirectory = "/root/patisserie";
+  };
+
+  clicks.storage.impermanance.persist.directories = [ "/root/patisserie" ];
+}