Joplin Server for arm64 & arm/v7

[dpoulton]

@etho201

... but may want to change this once a stable release is available

This post indicates that at this time 2.4.8-beta is considered to now be the stable release and has therefore been given the latest tag.

Joplin Server :latest?

For information I've now created a new script so that I can mark any beta, once it's proven, as "latest". So that will make it easier for me to quickly tag a release without having to rebuild everything, and also for users since you can now more frequently get updates (provided you use latest).