fix(ci): use actions/checkout v4 on host

Use official checkout action to fetch repository before running Gitleaks in Podman.

.gitea/workflows/test-ci.yml

@@ -17,12 +17,11 @@ jobs:
     name: Secret Detection (Gitleaks)
     runs-on: host
     steps:
-      - name: Fetch Code
-        run: |
-          git config --global --add safe.directory "$PWD"
-          git fetch --all
+      - name: Checkout Code
+        uses: actions/checkout@v4
 
-      - name: Run Gitleaks via Container Engine
+      - name: Run Gitleaks via Podman
         run: |
           echo "🔍 Lancement du scan Gitleaks..."
           podman run --rm -v "$PWD":/path zricethezav/gitleaks:v8.18.2 detect --source="/path" -v
+