Not converting svg files when the corresponding png already exists

publish_spec.sh

@@ -39,6 +39,11 @@ if [ ! $specs ] ; then
 fi
 
 for i in $(find -name "*.svg") ; do
+    png="${i%.svg}.png"
+    if [ -f "$png" ]; then
+      echo "Skipping $i — PNG already exists at $png"
+      continue
+    fi
 	echo "\n------ Converting SVG to PNG for pandoc --------"
 	docker run --rm -v $(pwd):/tmp/ -u $(id -u):$(id -g) "$TOOLS_DOCKER_IMAGE" svg2png "/tmp/$i"
 done