feat(ci/cd): add luacheck and stylua

.github/workflows/luacheck.yml

@@ -0,0 +1,10 @@
+name: Luacheck
+on: [push, pull_request]
+jobs:
+  Luacheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Luacheck linter
+        uses: lunarmodules/luacheck@v1

.github/workflows/stylua.yml

@@ -0,0 +1,15 @@
+name: StyLua
+on: [push, pull_request]
+jobs:
+  StyLuacheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: StyLua check
+        uses: JohnnyMorganz/stylua-action@v3
+        with:
+          token: ${{ secrets.GH_TOKEN }}
+          version: v0.18.2 # NOTE: we recommend pinning to a specific version in case of formatting changes
+          # CLI arguments
+          args: --check .