new: [docker-builder] remove all language except a few listed in environment variable.

precise/docker-builder/src/usr/local/bin/docker-update

@@ -7,6 +7,7 @@
 
 
 DOCKER_UPDATE_PATH=${DOCKER_UPDATE_PATH:-/srv/docker-builder}
+KEEP_ONLY_PO="fr en de"
 
 
 include common
@@ -79,6 +80,14 @@ cd "$tmpdir_changes"
 echo "Cleaning the change layer."
 find  . -name .git -type d -exec  rm -rf {} \; -prune
 
+if [ "$KEEP_ONLY_PO" ]; then
+    find_args=""
+    for lang in $KEEP_ONLY_PO; do
+        find_args="$find_args -not -name $lang.po"
+    done
+
+    find /opt/apps -name \*.po -type f $find_args -delete
+fi
 
 
 ## XXXvlab: if we produced it we shouldn't have to pull it