Fix luacheck

.github/workflows/build.yml

@@ -0,0 +1,11 @@
+on: [push, pull_request]
+name: build
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: lint
+        uses: Roang-zero1/factorio-mod-luacheck@master
+        with:
+          luacheckrc_url: ""

.luacheckrc

@@ -3,6 +3,7 @@ max_line_length = 80
 globals = {
     'formspec_ast',
     'minetest',
+    'modlib',
 }
 
 read_globals = {