Announce if running a stable or rolling version

[kulmann]

Description

User Stories

• As a web dev, I want know the info if the opencloud instance is running on a rolling or stable version, so that I can request the correct channel from the update server for displaying if an update is available.

Value

Display update availability in the web ui:
opencloud-eu/web#1158

Acceptance Criteria

• along with the current version, opencloud announces the update channel (rolling or stable)
• reuse the already existing edition field for this
• edition is made available via capabilities
• information must live in the binary (same as the version), configuration/environment variable is not an option!

Definition of ready

• Everybody needs to understand the value written in the user story
• Acceptance criteria have to be defined
• All dependencies of the user story need to be identified
• Feature should be seen from an end user perspective
• Story has to be estimated
• Story points need to be less than 20

Definition of done

• Functional requirements
  • Functionality described in the user story works
  • Acceptance criteria are fulfilled
• Quality
  • Code review happened
  • CI is green (that includes new and existing automated tests)
  • Critical code received unit tests by the developer
• Non-functional requirements
  • No sonar cloud issues
• Configuration changes
  • The next branch of the OpenCloud charts is compatible

[kulmann]

depends on #1580