add debug info

build.lua

@@ -370,6 +370,7 @@ function build_packages()
     end
 
     -- generate latest added packages
+    print(os.files("*"))
     io.gsub("_coverpage.md", "%*%*Recently added:.*%*%*", "**Recently added: " .. table.concat(latest, ", ") .. "**")
     io.gsub("zh-cn/_coverpage.md", "%*%*Recently added:.*%*%*", "**Recently added: " .. table.concat(latest, ", ") .. "**")
 end