Wercker needs to be able to check out code from your Git provider (GitHub, Bitbucket, or GitLab). This article describes how Wercker retrieves the code and how to set up repository access.
For private repositories, Wercker uses an SSH private-public key pair to check out code.
When an application is created in Wercker that’s based on a private repository, a public SSH key is added to the repository as a deploy key to authorize access to the repository. A deploy key is an SSH key that is associated with a single repository.
Wercker then uses the private SSH key to check out code.
For more information about deploy keys, see the documentation from your source control provider:
Note that it’s only possible to add an SSH key to a single repository. If you have a repository that uses private submodules, see Using Git Submodules.
For public repositories, it’s recommended that you do not add a deploy key. Instead, specify that the application is public when you create it, or set the application’s Privacy property to Public on the application’s Options page.