Add LuaCheck workflow

.github/workflows/check.yml

@@ -0,0 +1,14 @@
+name: "Check"
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: apt
+      run: sudo apt-get update && sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck mods

.luacheckrc

@@ -0,0 +1,19 @@
+unused_args = false
+allow_defined_top = true
+
+globals = {
+	"default"
+}
+
+read_globals = {
+	"minetest",
+	"dump",
+	"vector",
+	"VoxelManip", "VoxelArea",
+	"PseudoRandom", "PcgRandom",
+	"ItemStack",
+	"Settings",
+}
+
+-- Overwrites fields in minetest
+files["mods/default/init.lua"].globals = { "minetest" }