Basically the same as bug 1172416, just for 15.3.

Even after a forced zypper refresh, the only appstream metainfo is from the
non-oss repo, containing just Steam and Opera.

The reason is that the main repo(s) do not have any appdata archives, e.g.:
https://download.opensuse.org/distribution/leap/15.3/repo/oss/repodata/?P=*appdata*

Compared to TW:
https://download.opensuse.org/tumbleweed/repo/oss/repodata/?P=*appdata*

This makes applications which work based on those files like GNOME Software and
Plasma Discover pretty useless.

Bug ID	1191245
Summary	Main repos do not have appstream metadata
Classification	openSUSE
Product	openSUSE Distribution
Version	Leap 15.3
Hardware	Other
OS	Other
Status	NEW
Severity	Critical
Priority	P5 - None
Component	Other
Assignee	lubos.kocman@suse.com
Reporter	fabian@ritter-vogt.de
QA Contact	qa-bugs@suse.de
CC	mlin@suse.com
Found By	---
Blocker	---