github actions cache apt packages

- name: Install valgrind
  env:
    CACHE_HIT: ${{steps.cache-valgrind.outputs.cache-hit}}
    VALGRIND_VERSION: ${{secrets.VALGRIND_VERSION}}
  run: |
      if [[ "$CACHE_HIT" == 'true' ]]; then
        sudo cp --verbose --force --recursive ~/valgrind/* /
      else
        sudo apt-get install --yes valgrind="$VALGRIND_VERSION"
        mkdir -p ~/valgrind
        sudo dpkg -L valgrind | while IFS= read -r f; do if test -f $f; then echo $f; fi; done | xargs cp --parents --target-directory ~/valgrind/
      fi
- name: Cache valgrind
  uses: actions/[email protected]
  id: cache-valgrind
  with:
      path: "~/valgrind"
      key: ${{secrets.VALGRIND_VERSION}}