Add luacheck

.github/workflows/luacheck.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

@@ -0,0 +1,18 @@
+max_line_length = 100
+
+read_globals = {
+	"DIR_DELIM",
+	"dump",
+	"VoxelManip", "VoxelArea",
+	"PseudoRandom", "ItemStack",
+	"AreaStore",
+	"default",
+	"intllib",
+}
+
+globals = {
+	"minetest",
+	"exchange_shop",
+}
+
+ignore = {"212/self"}