fixup! WIP: cache apt packages in CI

Author: tom93

.github/workflows/ci.yml

@@ -38,6 +38,7 @@ jobs:
       - name: Cache apt packages
         uses: actions/cache@v4
         with:
+          key: apt-cache-${{ runner.os }}
           path: |
             /var/lib/apt/lists
             /var/cache/apt/archives