fix: use minimal native Gitea Actions syntax

.gitea/workflows/ci.yml

@@ -1,32 +1,21 @@
 name: CI
 
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
+on: [push, pull_request]
 
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
+      - run: |
+          git clone --depth 1 https://${{ gitea.server }}/${{ gitea.repository }} .
+          git fetch --depth=1 origin ${{ gitea.sha }}
+          git checkout ${{ gitea.sha }}
 
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.11'
-
-      - name: Install dependencies
-        run: |
+      - run: |
           python3 -m pip install --upgrade pip
           python3 -m pip install pytest ruff
           python3 -m pip install -e ".[dev]"
 
-      - name: Run tests
-        run: python3 -m pytest tests/ -v --tb=short
+      - run: python3 -m pytest tests/ -v --tb=short
 
-      - name: Run linting
-        run: python3 -m ruff check i18n_key_sync/ tests/
+      - run: python3 -m ruff check i18n_key_sync/ tests/