Add LUA linting

.drone.yml

@@ -11,9 +11,13 @@ steps:
   commands:
   - git clone https://git.f-brinker.de/fbrinker/elderscrolls-addon-achievementInfo.git sources
   - cd sources && git checkout $DRONE_COMMIT
-  when:
+
-    event: 
+- name: lint
-      - tag
+  image: alpine
+  commands:
+    - apk update && apk add --no-cache luarocks
+    - luarocks install luacheck
+    - luacheck sources
 
 - name: build
   image: alpine