Comment 1 for bug 1921397

Scenarios:
- build-snaps
  if the build-snap entries did not change, then noop
- base
  once bootstrapped, no more queries should go on. Manifest generation should use
  our stored values or local queries
- desktop extensions
  can be improved by adding injection logic, no need to refresh if already installed
- if snapcraft and the base are not injected
  don't try to refresh unless the channel has changed (only really applicable
  for snapcraft developers)