Added CI job for linting

.gitea/workflows/lint.yaml

@@ -0,0 +1,32 @@
+name: linting & formatting
+run-name: ${{ gitea.actor }} is checking linting & formatting.
+
+on:
+  push:
+    branches:
+      - main
+      - ci-test
+    tags:
+      - v*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        run: |
+          git init
+          git remote add origin ${{ gitea.event.repository.clone_url }}
+          git fetch --depth 1 origin ${{ gitea.ref }}
+          git checkout FETCH_HEAD
+          git lfs pull
+      - name: Setup Python
+        uses: actions/setup-python@v5.3.0
+        with:
+          python-version: '3.8'
+      - name: Install gdscript-toolkit
+        run: pip install -r requirements.txt
+      - name: Run gdLint
+        run: gdlint src/**.gd
+      - name: Check formatting
+        run: gdformat -c src