Thanks to @Catomizer gossip 0.12.0 now has a flatpak build.

nostr:nevent1qqsww0xg7nm9eadlfeus5dwg0gmh5cusyyeydayeez2cylxssqmp0ysppemhxue69uhkummn9ekx7mp047g0kh 

 Cool. I wish I knew how to make an Appimage for it. I tried but failed in the past. Gossip was the first client I used.