All GitBooks are essentially just Git repositories, which can be self-hosted. If your organization requires it to be hosted on premises I suppose you have a self-hosted Git service like GitLab.
In that case, GitLab Pages plays well with GitBook using GitLab CI. Otherwise, you can set up some CI/CD pipeline that automatically builds your books for you.
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All GitBooks are essentially just Git repositories, which can be self-hosted. If your organization requires it to be hosted on premises I suppose you have a self-hosted Git service like GitLab.
In that case, GitLab Pages plays well with GitBook using GitLab CI. Otherwise, you can set up some CI/CD pipeline that automatically builds your books for you.