Add code style lint and gdformat.

.github/workflows/code_style.yaml

@@ -0,0 +1,27 @@
+name: pre-commit
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  pre-commit-checks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+
+      - name: Install pre-commit
+        run: pip install pre-commit
+
+      - name: Run pre-commit
+        run: pre-commit run --all-files
+
+      - name: Check for modifications
+        run: |
+          git diff --quiet || (echo "Changes detected after pre-commit run!" && exit 1)

.pre-commit-config.yaml

@@ -0,0 +1,20 @@
+repos:
+  - repo: local
+    hooks:
+      - id: gdlint
+        name: gdlint
+        description: "gdlint - linter for GDScript"
+        entry: gdlint
+        language: python
+        language_version: python3
+        require_serial: true
+        types: [gdscript]
+
+      - id: gdformat
+        name: gdformat
+        description: "gdformat - formatter for GDScript"
+        entry: gdformat
+        language: python
+        language_version: python3
+        require_serial: true
+        types: [gdscript]