chore(ci): try fixing luacheck

.github/workflows/luacheck.yml

@@ -1,30 +1,19 @@
-# This is a basic workflow to help you get started with Actions
+name: Linting and style checking
 
-name: CI
+on: [push, pull_request]
 
-# Controls when the workflow will run
-on:
-  # Triggers the workflow on push or pull request events but only for the master branch
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
+  luacheck:
+    name: luacheck
     runs-on: ubuntu-latest
-
-    # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
 
-      # Runs a single command using the runners shell
-      - name: run linter (luacheck)
+      - name: Prepare
+        run: |
+          sudo apt-get update
+          sudo add-apt-repository universe
+          sudo apt install luarocks -y
+          sudo luarocks install luacheck
+      - name: Run luacheck
         run: luacheck .