Syntax fixes

latex/build-image.sh

@@ -9,8 +9,8 @@ docker buildx build . -t "$1"
 echo "Build complete, starting upload..."
 docker push "$1"
 
-if [[ -n "$OLD_IMG" ]]; then
-	if [[ "$OLD_IMG" != "$(docker image ls -q "$1")" ]]; then
+if [ -n "$OLD_IMG" ]; then
+	if [ "$OLD_IMG" != "$(docker image ls -q "$1")" ]; then
 		echo "New build uploaded, removing old image, id: $OLD_IMG"
 		docker image rm "$OLD_IMG"
 	fi

latex/entrypoint.sh

@@ -15,7 +15,7 @@ if [ -n "$EXTRA_PKGS" ]; then
 fi
 
 if [ -n "$INSTALL_HELPERS" ]; then
-    if [[ "$INSTALL_HELPERS" == "true" ]]; then
+    if [ "$INSTALL_HELPERS" == "true" ]; then
         CURR_DIR=$(pwd)
         mkdir ~/projects/
         cd ~/projects/