Force "update your app" notice on major version differences

[lorenjohnson]

Situation summary:

Currently we have a way to manually force all users to get an "Update your app" notice upon release of a new version. It however should automatically be shown if the version of the app the user is on is a previous major version.

• Agree to move to major versions if there are breaking changes in the app (largely from the backend/API)
• Add automatic "Update your app" warning to appear in any app that is a major version behind the current version

Key consideration: Is our API versioned? If it is this could be the flag instead of the App version. Maybe both are needed.

Acceptance criteria:

• A "Update your app" dialog appears on each app launch if the installed App is incompatible with the current version of the API
• Determine whether API is properly semver'd
  • If so, use this as the basis for the automatic message
  • If not, continue using current environment variable setting (I think it is HYLO_APP_MIN_VERSION or similar) on the backend