Choosing best location for authorized_keys!

Hello Friends,

I am trying to troubleshoot one scenario for the customer. In their server configuration, each vhost has it's own user. The option is to shell access chrooted.
The question is where would be the best place to store the authorized_keys file so that we can ssh in from the deployment server (SVN) without requiring user interaction?

The solution is needed for the deployment strategies from internally hosted SVN server to some of the websites.

I will appreciate the help in this matter.

Respectfully,