ci: fix checkout by installing git first

.gitea/workflows/ci.yml

@@ -6,22 +6,29 @@ on:
   pull_request:
     branches: [master]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   lint:
+    name: Lint & Check
     runs-on: ubuntu-latest
     container:
       image: python:3.11-slim
+
     steps:
-      - name: Checkout
+      - name: Setup and checkout
         run: |
+          apt-get update -qq && apt-get install -yqq --no-install-recommends git >/dev/null
           git clone --depth 1 --branch "${GITHUB_REF_NAME}" \
             "https://oauth2:${{ github.token }}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git" .
 
       - name: Install tools
-        run: pip install --quiet ruff
+        run: pip install -q ruff
 
       - name: Syntax check
         run: python -m py_compile harbor-ctl.py
 
       - name: Lint
-        run: ruff check --select=E,F,W harbor-ctl.py
+        run: ruff check harbor-ctl.py