fix(romm): snapshot Redis hourly like the upstream image (#17562)

* fix(romm): snapshot Redis hourly like the upstream image

Redis' default save policy (3600 1 300 100 60 10000) rewrites the whole dump.rdb every 5 minutes on an idle RomM, because the RQ workers and scheduler change keys constantly. With the Switch TitleDB and PS2 serial caches the dump is ~50 MB, so an idle container writes ~14 GB/day. Upstream fixed this for the Docker image (rommapp/romm#3983, REDIS_SAVE_POLICY default "3600 1"), but that lives in docker/init_scripts/init, which the LXC install never runs. Apply the same policy on install and, for existing containers, on update unless a save policy is already set.

* Update ct/romm.sh

* Update install/romm-install.sh

---------

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

ct/romm.sh

@@ -56,6 +56,13 @@ function update_script() {
     msg_ok "Migrated RQ services"
   fi
 
+  if ! grep -q '^save ' /etc/redis/redis.conf; then
+    msg_info "Reducing Redis snapshot frequency"
+    echo 'save 3600 1' >>/etc/redis/redis.conf
+    $STD redis-cli CONFIG SET save "3600 1"
+    msg_ok "Reduced Redis snapshot frequency"
+  fi
+
   if check_for_gh_release "romm" "rommapp/romm"; then
     msg_info "Stopping Services"
     systemctl stop romm-backend romm-worker romm-scan-worker romm-scheduler romm-watcher

install/romm-install.sh

@@ -167,6 +167,7 @@ echo "__version__ = \"$(cat ~/.romm)\"" >/opt/romm/backend/__version__.py
 
 msg_info "Creating environment file"
 sed -i 's/^supervised no/supervised systemd/' /etc/redis/redis.conf
+echo 'save 3600 1' >>/etc/redis/redis.conf
 systemctl restart redis-server
 systemctl enable -q --now redis-server
 AUTH_SECRET_KEY=$(openssl rand -hex 32)