Fix: Wrap apt calls into a retry so we can ideally jump from a slow mirror to a faster one

.github/workflows/ci-frontend.yml

@@ -231,9 +231,10 @@ jobs:
       - name: Install dependencies
         run: cd src-ui && pnpm install --frozen-lockfile
       - name: Install backend system dependencies
-        run: |
-          apt-get update
-          apt-get install --yes --quiet --no-install-recommends libmagic1
+        timeout-minutes: 12
+        uses: ./.github/actions/apt-install
+        with:
+          packages: libmagic1
       - name: Install backend dependencies
         env:
           PYTHON_VERSION: ${{ steps.setup-python.outputs.python-version }}