Handle building KOReader

[Eeems]

We may need to push out EBFs specific to the reMarkable outside the normal KOReader release cycle. In order to do that, it would be good to have reproducible builds instead of relying on their binary releases.

[matteodelabre]

What is EBF?

[Eeems]

Emergency Bug Fix.

[matteodelabre]

Gotcha. Thanks!

[Eeems]

No problem, I sometimes forget what abbreviations people are aware of outside my industry.

[Eeems]

Do we need this anymore? Or are we fine with just patching the built files like we have already?

[matteodelabre]

I think building from source should still be a target, since having less intermediates is better for security IMO. But I agree that this is low priority currently.

[raisjn]

patching the frontend is fine (the lua files) for keeping us up to date with KOReader nightly or even forward from KOReader and should work the majority of the time. we've only had to once modify koreader-base (to tell KOReader not to lock the input devices) which required actual code compilation. in a case like that - we'd have to wait for the monthly release or switch to using nightly to get those improvements.