chore: adjust prepare-switch-scroll script

Author: MarcStdt

.docker/prepare-switch-scroll.sh

@@ -3,8 +3,10 @@ CURRENT_SCROLL=$(cat $SCROLL_DIR/scroll.yaml | yq .name)
 
 echo "Current scroll: $CURRENT_SCROLL"
 
-if [ "$CURRENT_SCROLL" != "$SCROLL" ]; then
-    druid run switch-scroll $SCROLL
+DESIRED_SCROLL="$SCROLL@$SCROLL_VERSION"
+
+if [ "$CURRENT_SCROLL" != "$DESIRED_SCROLL" ]; then
+    druid run switch-scroll $DESIRED_SCROLL
     rm $SCROLL_DIR/scroll-lock.json
 else
     echo "Already on $SCROLL. Nothing to do."