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A simpler way to get the public key on to the server:
Assuming your local and remote usernames are the same. If not, prepend the username and an at sign before the hostname, just like any other ssh command.
The utility is available in Homebrew for Mac OS:
brew install ssh-copy-id
If you're looking to not run the deployment as root / a passwordless sudoer, have a look at these playbooks: https://github.com/thredded/thredded-ansible
I built them to deploy a Rails app with Thredded but it should work for any Rails app.