Add new GitLab CI/CD predefined environment variables: CI_COMMIT_AUTHOR
### Release notes Previously, if you wanted to know the author of a commit, you would need to retrieve this with an extra API call. Now this details is readily available as predefined CI/CD variables by using `CI_COMMIT_AUTHOR`. Thanks to [Craig Andrews](https://gitlab.com/candrews) for this contribution! https://docs.gitlab.com/ee/ci/variables/predefined_variables.html ### Proposal The variable CI_COMMIT_AUTHOR seems to be missing in the predefined variables. The only way to get the author of a commit is to do an extra API call. Is there any problem to include it in the predefined variable ? Reference: https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
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