build.sh: use |& bashism

Author: juhp

automated/build.sh

@@ -171,7 +171,7 @@ fi
 docker run $ARGS_BUILD $IMAGE nice -n 15 /bin/bash -c "
     chown $USER $HOME
     exec sudo -E -u $USER env \"HOME=$HOME\" \"PATH=\$PATH\" curator build --jobs $JOBS
-    " 2>&1 | tee $SHORTNAME-build.log
+    " |& tee $SHORTNAME-build.log
 
 # Make sure we actually need this snapshot. We used to perform this check
 # exclusively before building. Now we perform it after as well for the case of