[git] Heroku 'Permission denied (publickey) fatal: Could not read from remote repository' woes

I know this has already been answered. But I would like to add my solution as it may helpful for others in the future..

A common key error is: Permission denied (publickey). You can fix this by using keys:add to notify Heroku of your new key.

In short follow these steps: https://devcenter.heroku.com/articles/keys

First you have to create a key if you don't have one:

ssh-keygen -t rsa

Second you have to add the key to Heroku:

heroku keys:add

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