fix(ci): use official gitleaks action

Replace manual curl binary download with gitleaks/gitleaks-action to resolve CLI flag parsing issues.

.gitea/workflows/test-ci.yml

@@ -22,9 +22,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Run Gitleaks Scan
-        run: |
-          echo "🔍 Lancement du scan Gitleaks..."
-          curl -sSFL https://github.com/gitleaks/gitleaks/releases/download/v8.18.2/gitleaks_8.18.2_linux_x64.tar.gz | tar -xz gitleaks
-          ./gitleaks detect --source . -v
-          rm gitleaks
+      - name: Run Gitleaks
+        uses: gitleaks/gitleaks-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}