add luacheck and mod.conf

.github/workflows/luacheck.yml

@@ -0,0 +1,13 @@
+name: luacheck
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: apt
+      run: sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck ./

.luacheckrc

@@ -0,0 +1,11 @@
+unused_args = false
+
+globals = {
+    "minetest",
+}
+
+read_globals = {
+	"default",
+	"walls",
+	"doors",
+}

README.md

@@ -1,4 +1,6 @@
-# Ice stuff [ice]
+# Ice nodes [ice]
+
+[![luacheck](https://github.com/mt-mods/ice/workflows/luacheck/badge.svg)](https://github.com/mt-mods/ice/actions)
 
 Ice nodes from terumisc
 

mod.conf

@@ -0,0 +1,3 @@
+name = ice
+description = Adds more ice nodes
+depends = default, walls, doors