Release notes for v1.12.0

Changelog since v1.11.1

Changes by Kind

Feature

• Add Beta CR to Operator manifest (#207, @Szymongib)
• Add ImagePullPolicy to ClusterInstallation spec (#204, @erezo9)
• Add mechanism to migrate from ClusterInstallation to Mattermost resource. (#206, @Szymongib)
• Introduce initial version of beta spec Mattermost CR controller (#205, @Szymongib)

The image for this release is docker.io/mattermost/mattermost-operator:v1.12.0

Thanks to all our contributors!