Heroku Can't Push

$ git push heroku master

Permission denied (publickey).
fatal: The remote end hung up unexpectedly

heroku keys:add

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http://stackoverflow.com/questions/8786564/cannot-push-to-heroku-because-key-fingerprint/8803103#8803103

ssh-keygen -t rsa -C "giordano.scalzo[at]gmail.com" -f ~/.ssh/id_rsa_heroku

then added to my machine

ssh-add ~/.ssh/id_rsa_heroku

and, finally, to Heroku

heroku keys:add ~/.ssh/id_rsa_heroku.pub

After that,

git push heroku master