[enh] container: use Wolfi OS as base image

Wolfi OS images are specifically designed for container use. Using a specially designed base image for containers not only reduces maintenance burdens, but improves overall experience for developers (fewer packages we have to track) and end users (smaller images).

Discussion here: https://github.com/searxng/searxng/issues/4753

container/docker-entrypoint.sh

@@ -71,6 +71,7 @@ patch_searxng_settings() {
         "${CONF}"
 }
 
+# FIXME: Always use "searxng:searxng" ownership
 update_conf() {
     FORCE_CONF_UPDATE=$1
     CONF="$2"