Release notes for v1.18.0

Changelog since v1.17.0

Changes by Kind

Chore

• Bump Go and default Mattermost image versions (#275, @gabrieljackson)
• Do not log Mattermost spec on update (#272, @Szymongib)
• Update dependencies and tools (#271, @Szymongib)

Feature

• Add ability for specifying custom DNSConfig and DNSPolicy (#265, @stafot)
• Add e2e tests for external DB and file-store configuration (#273, @Szymongib)
• Support multiple domains (#274, @Szymongib)