Hi- Would it be possible to sign updates using my own key? I guess I'd have to change [pubkey_boot](https://github.com/solokeys/solo/blob/91584538308f0f0906c988e6dd9ca1583e1e41d1/targets/stm32l432/bootloader/pubkey_bootloader.c#L3). Do you have details of how you sign your updates? Thanks David