Capistrano deploy - Permission denied - amazon-ec2

I'm trying to deploy my application with capistrano but I'm having some problems. My machine is a ec2 amazon and I have the .pem locally. I can do ssh and run commands with no problem, but for cap production deploy I get the following error:
DEBUG [4f4633f7] Command: ( export GIT_ASKPASS="/bin/echo" GIT_SSH="/tmp/git-ssh-hybrazil-production-ronanlopes.sh" ; /usr/bin/env git ls-remote --heads git#git#github.com:fneto/hybrazil.git )
DEBUG [4f4633f7] Permission denied (publickey).
DEBUG [4f4633f7]
DEBUG [4f4633f7] fatal: Could not read from remote repository.
DEBUG [4f4633f7]
DEBUG [4f4633f7]
DEBUG [4f4633f7] Please make sure you have the correct access rights
DEBUG [4f4633f7]
and the repository exists.
DEBUG [4f4633f7]
On my production/deploy.rb, I have the config like this:
set :ssh_options, {
keys: %w(/home/ronanlopes/Pems/hybrazil-impulso.pem ~/.ssh/id_rsa),
forward_agent: true,
auth_methods: %w(publickey)
}
any ideas? Thanks in advance!

You can add your key to agent, use command:
ssh-add ~/.ssh/id_rsa
In your code you should use full path to ssh key, without pem:
keys: %w(/home/user_name/.ssh/id_rsa)

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