forward TARGETS into container, too

docker-build.sh

@@ -31,6 +31,7 @@ docker run -ti -h ffpb-build -v "$MYDIR:/code" \
     --env BRANCH="$BRANCH" \
     --env VERBOSE="$VERBOSE" \
     --env VERSION="$VERSION" \
+    --env TARGETS="$TARGETS" \
     ffpb/build
 
 popd > /dev/null