Configure apt not to fetch dep-11 metadata from Ubuntu repos

[danirabbit]

Problem

We're currently fetching appstream data, icons, etc for apps that we never show in AppCenter, which makes update fetching take longer than it needs to

Proposal

I'm not sure if this is possible, but if we can we should try to configure apt such that we only download metadata from our repos since that's the only stuff we show in AppCenter

Prior Art (Optional)

No response

[davidmhewitt]

Launchpad PPAs don't have dep-11 metadata, hence why https://github.com/elementary/appstream-data exists. So we can probably just disable it altogether.