[Feature Request]: When creating output in 'packages_hashed', and 'debs', remove previous of same specification

### Which feature would you like to have?

A mechanism that does clean up between builds of in principle the same image. Am working inside a Virtual Box with ample, but limited, room. When creating a customized image it is normal to have to go through some iterations. Every round the build system adds quite substantial files (~300 MB in my case) in output/packages-hashed, and output/debs, without removing the ones left behind by previous sessions. After a while the available disk memory gets filled up this way with large and useless files.

### Funding

- [ ] [I am willing to cover expenses](https://www.armbian.com/contact/)