def matching_pubkey
      Pubkey.all
        .detect { |key| key.verify(self) }
        .tap { |key| self.pubkey = key }
    end
def matching_pubkey
      Pubkey.all
        .detect { |key| key.verify(self) }
        .tap { |key| self.pubkey = key }
    end
Public: Find the pubkey that can verify the builds
 signature.