message: Ask users to test nightly before reporting issue
diff: <!--
  This repository contains the pre-release Admin Console for Keycloak which is still in development and not enabled by default. If you are looking to report an issue with the released Keycloak Admin Console or other parts of Keycloak, please consult the Keycloak Community (https://www.keycloak.org/community) page to find the correct place to start your discussion.
  +
  +Before submitting an issue, please verify that your issue hasn't already been resolved by testing it on a nightly version of Keycloak: https://github.com/keycloak/keycloak/releases/tag/nightly
  -->
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