Cleanup staging dir properly

Author: janaz

auto/package-cmd

@@ -26,11 +26,11 @@ tar -xJ -f "${tmp_dir}/${node_archive}" --strip 1 -C "${node_dir}"
 
 #prepare staging dir
 mkdir -p "${stage_dir}"
-rm -rf "${stage_dir}/*"
+rm -rf "${stage_dir}"/*
 cp -a package.json yarn.lock src/* "${node_dir}"/bin/node "${stage_dir}/"
 
 #install deps and create archive
 cd "${stage_dir}"
 yarn install --frozen-lockfile --production --no-bin-links --ignore-optional
-rm -f yarn.lock
+rm -f yarn.lock package.json
 7za a -mx9 -r layer.zip .