fix: use GitHub Actions syntax compatible with Gitea

.gitea/workflows/ci.yml

@@ -1,27 +1,32 @@
 name: CI
 on: [push, pull_request]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        run: |
-          git clone https://${{ gitea.server }}/${{ gitea.repository }} .
-          git checkout ${{ gitea.sha }}
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
-      - name: Setup
-        run: |
-          pip3 install --upgrade pip
-          pip3 install pytest click pyyaml rich
-          pip3 install -e .
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
 
-      - name: Tests
+      - name: Install dependencies
         run: |
-          (pytest tests/ -v --tb=short && echo "TESTS_PASSED") || echo "TESTS_COMPLETED"
+          python3 -m pip install --upgrade pip
+          python3 -m pip install pytest ruff click pyyaml rich
+          python3 -m pip install -e .
 
-      - name: Lint
+      - name: Run tests
         run: |
-          (pip3 install ruff && ruff check i18n_key_sync/ tests/ && echo "LINT_PASSED") || echo "LINT_COMPLETED"
+          python3 -m pytest tests/ -v --tb=short
 
-      - name: Done
-        run: echo "CI workflow execution completed"
+      - name: Run linting
+        run: |
+          python3 -m ruff check i18n_key_sync/ tests/