This directory contains all keys that are currently signing Alby Hub releases.
The name of the file must match exactly the suffix that user is going to use
when signing a release.
For example, if the key is called im-adithya.asc then that user should upload a
signature file called manifest-im-adithya.txt.asc.
In addition to adding the key file here there is a main mainfest.txt.asc file
that is used by the systemd install/update scripts. This must be provided by a
single verified signing user per release.