feat(workflow): Add luacheck github action (#18)

* Add luacheck action

* Fix workflow file

.github/workflows/checks.yml

@@ -7,15 +7,28 @@ on:
       - main
 
 jobs:
-  stylua:
-    name: Formatting
+  formatting:
+    name: Formatting (stylua)
     runs-on: ubuntu-latest
     steps:
       - name: Fetch code
         uses: actions/checkout@v4
+
       - name: Check formatting
         uses: JohnnyMorganz/stylua-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           version: latest
           args: --check .
+
+  lint:
+    name: Lint (luacheck)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch code
+        uses: actions/checkout@v4
+
+      - name: Run luacheck
+        uses: lunarmodules/luacheck@v1
+        with:
+          args: lua

.luacheckrc

@@ -0,0 +1,5 @@
+std = luajit
+
+globals = {
+  "vim",
+}