Created attachment 770860 [details]
complete self-contained test repository
For completeness, this attachment is a self contained test repo with a single
dummy package. The issue I report here persists - adding this repository to a
tumbleweed host still using gpg2 2.2.6 + rpm 4.14.1-6.1 worked without issue,
while the up-to-date host with gpg2 2.2.7 + rpm 4.14.1-7.1 shows the "unknown
key" error.