chore(github): add checks for CI/CD

.github/workflows/check.yml

@@ -0,0 +1,23 @@
+name: Style Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  style:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: JohnnyMorganz/stylua-action@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
+          # CLI arguments
+          args: --check .
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: lunarmodules/luacheck@v1

.luacheckrc

@@ -0,0 +1,11 @@
+globals = {
+  "astronvim",
+  "vim",
+}
+
+cache = true
+self = false
+ignore = {
+  "631", -- max_line_length
+  "212/_.*", -- unused argument, for vars with "_" prefix
+}