Comment 2 for bug 1947169

Brief notes from today's meeting:

 * Rather than having Launchpad work out how to mutate the (charm revision, resource revisions) tuple, the store will be changed to do this automatically when releasing new revisions. William says that this was always planned but not yet implemented. This shouldn't end up requiring any changes to Launchpad.
 * Somewhat relatedly, it would be useful to have the charm build request end up in charm metadata in a similar way that it does for charms. Facundo says that the Starcraft team would prefer this to be consistent between snaps and charms, so they'll add something along the lines of the `SNAPCRAFT_IMAGE_INFO` environment variable used for snaps; once that exists, Launchpad will set it and the store will ingest it.