Sandboxed agents version

Currently even if docker images rebuild is triggered the agent inside of it is not really updated see [example](https://github.com/raine/workmux/actions/runs/23815643436/job/69414420404#step:6:243) [example2](https://github.com/raine/workmux/actions/runs/23815643436/job/69414420443#step:6:240)
So most probably re-building with `--no-cache` is the solution here

