fix(bref): previous pr (#78)

Author: Sébastien HOUZÉ

bref/entrypoint.sh

@@ -5,7 +5,7 @@ set -e
 
 GGLL_LOCALHOST_IP=$(dig +short -t A ggll.localhost)
 
-if [ id -u = 0 ]; then
+if [ $(id -u) = 0 ]; then
   echo "export GGLL_LOCALHOST_IP=$GGLL_LOCALHOST_IP" >> ~/.bashrc
 fi