no need to store these things in the slug

bin/compile

@@ -164,6 +164,7 @@ cache_build() {
     save_cache_directories "$BUILD_DIR" "$CACHE_DIR" $cache_directories
   fi
   save_signature
+  remove_caches_from_slug "$BUILD_DIR"
 }
 
 header "Caching build"

lib/cache.sh

@@ -56,6 +56,11 @@ restore_cache_directories() {
   done
 }
 
+remove_caches_from_slug() {
+  local build_dir=${1:-}
+  rm -rf $build_dir/.npm $build_dir/.cache/yarn
+}
+
 clear_cache() {
   rm -rf $CACHE_DIR/node
   mkdir -p $CACHE_DIR/node