apk3: signing key generation applet
With the move to apk3, it will no longer be necessary to directly use
openssl for signing, but apparently it is still necessary to use it to generate keys. Maybe apk should provide an applet to deal with that, to be able to drop direct
openssl usage from tooling entirely?
Not entirely sure what the best interface to it would be. It probably does not have to be too user friendly, since its main purpose would be to be used from tooling (like
abuild or others)