Remote Repositories enable you to proxy and cache Alpine Linux packages.
To specify that a Remote Repository supports Alpine Linux packages, you need to set its Package Type to Alpine when it is created.
Retrieve RSA keys in a Remote Repository
When setting up a Remote Repository, you will have to retrieve the RSA keys manually and set it in the apk client.
You can avoid retrieving the keys manually by aggregating a Remote Repository in a Virtual Repository that will enable you to use the Virtual Repository's key-pair to re-sign the aggregated index file.
In order to do so, configure your Virtual repository with a key-pair and then use Set Me Up to retrieve the Virtual public key to your local machine.