ci: add lint job

Author: MunifTanjim

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    name: luacheck
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Get Cache Key
+        id: luver-cache-key
+        env:
+          CI_RUNNER_OS: ${{ runner.os }}
+          CI_SECRETS_CACHE_VERSION: ${{ secrets.CACHE_VERSION }}
+        run: |
+          echo "::set-output name=value::${CI_RUNNER_OS}-luver-${CI_SECRETS_CACHE_VERSION}-luacheck-$(date -u +%Y-%m-%d)"
+        shell: bash
+      - name: Setup Cache
+        uses: actions/cache@v2
+        with:
+          path: ~/.local/share/luver
+          key: ${{ steps.luver-cache-key.outputs.value }}
+      - name: Setup Lua
+        uses: MunifTanjim/luver-action@v1
+        with:
+          default: 5.1.5
+          lua_versions: 5.1.5
+          luarocks_versions: 5.1.5:3.8.0
+      - name: Setup luacheck
+        run: |
+          luarocks install luacheck
+      - name: Lint
+        run: ./scripts/lint.sh --no-cache