Suggestion: add Security Express Updates

IodéOS currently offers both beta and stable versions. For some users I would like to have security updates as fast as possible, without beta. CalyxOS has solved this with the “Security Express” update channel. ASB (security updates) are released there as quickly as possible - without extensive testing. It could be called “ASB-beta”. However, no new features are tested. This is done in beta.

Maybe this is an option for iodéOS as a possible compromise between manageable effort and faster security updates.