Update stack-weekly.sh

Author: heather999

jupyter-kernels/setup/stack-weekly.sh

@@ -35,6 +35,7 @@ export PYTHONPATH=$PYTHONPATH:$LSST_INST_DIR/$LSST_PYTHON_VER
 if [ -n "$DESCSTACKUSERBASE" ]; then
     export PYTHONUSERBASE=$DESCSTACKUSERBASE
     unset PYTHONUSERSITE
+    export PATH=$PYTHONUSERBASE/bin:$PATH       
     export PYTHONPATH="$PYTHONUSERBASE/lib/$DESCPYTHONVER/site-packages:$PYTHONPATH"
     echo "using DESCPYTHONUSERBASE: $DESCSTACKUSERBASE"
 fi