linux: fix appimage (#731)

* always use latest version of pkg2appimage

* generate zsync file to make the appimage updateable

* install fuse for GH actions

* remove fuse

* run AppImage

* comment converts

* getting info on images

* using bugfix from #536

* add DOCKER_BUILD flag

* extract AppImageAssistant before running it

* use local `convert` and not from `pkg2appimage`

.github/workflows/linux.yml

@@ -101,8 +101,8 @@ jobs:
             ./*.tar.gz
             ./*.deb
             ./*.rpm
-            ./*.AppImage
-            ./*.AppImage.zsync
+            ./VSCodium-*.AppImage
+            ./VSCodium-*.AppImage.zsync
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}