First of all I did a:

capify .

And used this deploy.rb

Then to setup the current, releases, etc. directories:

cap deploy:setup

Then, when I tried to login via ssh with shared key: nothing! After some searching I found out that capistrano messed up the permissions on the .ssh directory :(

To fix it:

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chmod 755 $HOME
chmod 755 $HOME/.ssh
chmod 644 $HOME/.ssh/authorized_keys