add format workflow

.github/workflows/format.yml

@@ -0,0 +1,46 @@
+name: Format
+on:
+  push:
+    paths:
+      - 'lua/**.lua'
+      - '**.md'
+      - '.github/**.yml'
+    branches: [main, dev]
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      STYLUA_VERSION: 0.11.0
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup git
+        run: |
+          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          printf 'STYLE_BRANCH=bot/style/%s\n' ${GITHUB_REF#refs/heads/} >> $GITHUB_ENV
+
+      - name: Apply stylua
+        run: |
+          git checkout -b ${STYLE_BRANCH}
+          curl -Lo /tmp/stylua.zip https://github.com/JohnnyMorganz/StyLua/releases/download/v${STYLUA_VERSION}/stylua-${STYLUA_VERSION}-linux.zip
+          unzip -d /tmp/ /tmp/stylua.zip
+          chmod +x /tmp/stylua
+          /tmp/stylua --config-path=.stylua.toml lua/
+
+      - name: Apply prettier
+        uses: creyD/prettier_action@v4.0
+
+      - name: Create PR
+        run: |
+          if ! [[ -z $(git status -s) ]]; then
+            git add -u
+            git commit -m "chore: format"
+            git push --force https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY} ${STYLE_BRANCH}
+            gh pr create --fill --base ${GITHUB_REF#refs/heads/} --head ${STYLE_BRANCH} || true
+          fi