How to generate and store read/write SSH keys

If you want to enable write-permissions to your checkout repo within a job, interact with other private repositories entirely, you'll need to add an SSH key to CircleCI which provides write access. 

Check out our docs with with full instructions to generate and add the keys

See GitHub and Bitbucket documentation for guidelines on storing SSH public keys:

• https://developer.github.com/v3/guides/managing-deploy-keys
• https://confluence.atlassian.com/bitbucket/use-deployment-keys-294486051.html