apk-keys - Man Page

The /etc/apk/keys directory stores RSA public keys which are trusted by apk to verify cryptographic signatures for packages. To trust a new key, simply add the armored public key to this directory. See abuild-keygen(1) for information on generating new keys, abuild-sign(1) for using these keys to sign files, and apk-verify(8) for verifying keys against the apk trust store.

apk-repositories(5).