Add backup folder to docker-compose.prod

Signed-off-by: Lukas Schaefer <lukas@lschaefer.xyz>

docker-compose.prod.yaml

@@ -24,6 +24,8 @@ services:
       - TURNSTILE_SECRET=${TURNSTILE_SECRET}
       - TURNSTILE_SITEKEY=${TURNSTILE_SITEKEY}
       - TMDB_API_KEY=${TMDB_API_KEY}
+    volumes:
+      - backups:/backup
   db:
     networks:
       - default
@@ -43,3 +45,4 @@ networks:
   caddy_website:
     external: true
   default:
+  backups: