Use a faster and newer LuaCheck

.github/workflows/build.yml

@@ -1,16 +1,12 @@
-name: build
+name: luacheck
 on: [push, pull_request]
-
 jobs:
   luacheck:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+      - name: Checkout
-    - name: Install Luarocks
+        uses: actions/checkout@v4
-      run: |
+      - name: Luacheck
-        sudo apt-get update -qyy
+        uses: lunarmodules/luacheck@master
-        sudo apt-get install luarocks -qyy
+        with:
-    - name: Install Luacheck
+          args: mods
-      run: luarocks install --local luacheck
-    - name: Run Luacheck
-      run: $HOME/.luarocks/bin/luacheck mods