[shipwright-users] Build and Website repository's default branch renamed to `main`

To all Shipwright Contributors and End Users: In an effort to make Shipwright an inclusive and safe space, we have renamed the default branch for the build controller (our most active repository) and website from "master" to "main." This implements the work that was discussed and agreed to in build issue #666 [1].To learn more about why we are making this change and why the use of "master" is considered harmful, please refer to the guidance from the Inclusive Naming initiative [2]. Existing pull requests have already been updated to point to the "main" branch. Pull requests for github.com/shipwright-io/build should be rebased to update their GitHub actions configuration [3]. Contributors should update their forks to sync changes to the "main" branch from here on. If you have any questions or concerns regarding this change, please reply on the list or reach out to us on slack. Sincerely, The Shipwright Maintainers [1] https://github.com/shipwright-io/build/issues/666 [2] https://inclusivenaming.org/language/word-list/ [3] https://github.com/shipwright-io/build/pull/671 -- Adam Kaplan He/Him Principal Software Engineer Red Hat <https://www.redhat.com> 100 E. Davie Street adam.kaplan(a)redhat.com T: 1-919-754-4843 <https://www.redhat.com>