build.sh: also delete compiled files from cache dir

build.sh

@@ -2,7 +2,11 @@
 cd "$(dirname "$0")"
 
 mkdir dist
+mkdir dist/cache
+
+# clean
 (cd dist && (ls | grep -v "cache" | grep -v "config.json" | xargs rm -r))
+(cd dist/cache && (ls | grep -v ".json" | xargs rm -r))
 
 # build
 (cd backend && npm i && npm run build) || exit 1