Adding a public key to KEYS file
Instruction for Calcite release contains point where a public key should be
added to the KEYS file.
Is this file in https://dist.apache.org/repos/dist/release/calcite/ taken
from a mirror in another place, or it should be modified in this place?
Also, in the instructions for other projects, I found that svn may be used
to push changes directly to the dist.apache.org, but I think I don't have
an access to do that.