Currently we're going to ship all the apk keys in the keyring, but the
preference is to ship and use single release/branch specific key so lets
use openwrt-snapshots.pem for apk explicitly as well.
Fixes: 2cea050024 ("openwrt-keyring: add apk public key for signing of package indexes")
Signed-off-by: Petr Štetiar <ynezz@true.cz>
Link: https://github.com/openwrt/openwrt/pull/16852
Signed-off-by: Robert Marko <robimarko@gmail.com>
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