Add LUA linting

.drone.yml

@@ -16,8 +16,7 @@ steps:
   image: alpine
   commands:
     - apk update
-    - apk add --no-cache lua5.1 lua5.1-dev luarocks5.1
-    - rm -rf ~/.cache/luarocks
+    - apk add --no-cache wget lua5.1 lua5.1-dev luarocks5.1
     - luarocks-5.1 install luacheck
     - luacheck sources