CI: Ensure concatenating screenshot pieces in right order
On some systems, `ls ...*...` lists them in random order; and if there
are ever >9 pieces, lexicographic sort will be wrong, must sort in
numeric order.
diff --git a/circle.yml b/circle.yml
index 13f03b1..62ffec7 100644
--- a/circle.yml
+++ b/circle.yml
@@ -178,7 +178,7 @@
# Stitch together images
- |-
for img in $(ls $CIRCLE_ARTIFACTS/imgs/pieces/); do
- convert $CIRCLE_ARTIFACTS/imgs/pieces/$img/*.png -append $CIRCLE_ARTIFACTS/imgs/$img.png
+ convert $(ls -1 $CIRCLE_ARTIFACTS/imgs/pieces/$img/*.png | sort -n) -append $CIRCLE_ARTIFACTS/imgs/$img.png
done
# Download the latest mathquill artifacts from master.
