[fix] container: missing data volume (#399)

Synced from a76ccba9c5/container/base.yml (L54)

docker-compose.yaml

@@ -44,6 +44,7 @@ services:
       - "127.0.0.1:8080:8080"
     volumes:
       - ./searxng:/etc/searxng:rw
+      - searxng-data:/var/cache/searxng:rw
     environment:
       - SEARXNG_BASE_URL=https://${SEARXNG_HOSTNAME:-localhost}/
       - UWSGI_WORKERS=${SEARXNG_UWSGI_WORKERS:-4}
@@ -61,3 +62,4 @@ volumes:
   caddy-data:
   caddy-config:
   valkey-data2:
+  searxng-data: