Just some information, not details:

• Developing_Qt:QA wiki pages in qt-project.org
• Jenkins – An extendable open source continuous integration server, the CI system which is currently used in qt-project.org
• Jenkins: The Definitive Guide, a book about Jenkins
• QtSDK repo in gitorious, or in codereview, if you want to know how to get a release package from source
• QtQA repo in gitorious, or in codereview, if you want to know how CI is running
• qt-project mailing list: ci-reports
• qt-project mailing list: releasing
• zutubi: pulse, the CI system which was used in qt-project.org before