ci: add format job

Author: MunifTanjim

.github/workflows/ci.yml

@@ -37,3 +37,16 @@ jobs:
           luarocks install luacheck
       - name: Lint
         run: ./scripts/lint.sh --no-cache
+
+  format:
+    name: stylua
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Check Format
+        uses: JohnnyMorganz/[email protected]
+        with:
+          version: 0.11.2
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --color always --check evdev/