[fix] everything is logged with "priority 3" on journal

Closes: https://github.com/searxng/searxng/issues/3649

Dockerfile

@@ -35,7 +35,6 @@ RUN apk add --no-cache -t build-dependencies \
     git \
  && apk add --no-cache \
     ca-certificates \
-    su-exec \
     python3 \
     py3-pip \
     libxml2 \

dockerfiles/docker-entrypoint.sh

@@ -175,4 +175,4 @@ unset MORTY_KEY
 
 # Start uwsgi
 printf 'Listen on %s\n' "${BIND_ADDRESS}"
-exec su-exec searxng:searxng uwsgi --master --http-socket "${BIND_ADDRESS}" "${UWSGI_SETTINGS_PATH}"
+exec uwsgi --master --uid searxng --gid searxng --http-socket "${BIND_ADDRESS}" "${UWSGI_SETTINGS_PATH}"