Handling of the authentication token rotation

Status Update - 2024-05-07

The MR gitlab-org/gitlab-runner!4721 (merged) adds the support for FF_DISABLE_AUTOMATIC_TOKEN_ROTATION which can be used to disable automatic token rotation

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As long as gitlab-runner is running, it will attempt to rotate the token itself when it reaches 75% of its lifetime, saving back the new token to the config.toml file

Extract of this post

GitLab Runner is able to rotate its authentication token automatically when this one is close to expiration. However there is no existing mechanism to handle this rotation with the GitLab Runner Operator:

• How the operator is notified of this update ?
• How the new token is transmitted to the Operator ?
• etc ...

This functionality is currently missing and should/must be implemented before the removal of the legacy registration token

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