Support encrypting files before sending

[hwittenborn]

[ghost]

Why not implement gocryptfs into the flatpak. Like that you have a "binary of gocryptfs " if enabled, and you don't have to develop something yourself.

[hwittenborn]

Celeste uses rclone for syncing, and it supports encrypting before syncing actually. I'll probably end up using that just because it's already integrated into rclone.

I just need to figure out how I want to set up Celeste's config file - I just haven't figured out exactly how I want to/should do that yet