The snap package generated from the GitHub artifact has been tested and it works well:

mkdir: cannot create directory ‘/run/user/0’: Permission denied
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory

Unhandled Exception:
System.Exception: Running as root user is not supported
  at GWallet.Frontend.XF.Gtk.Main.main (System.String[] argv) [0x00020] in <65dc7568944123fea74503836875dc65>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.Exception: Running as root user is not supported
  at GWallet.Frontend.XF.Gtk.Main.main (System.String[] argv) [0x00020] in <65dc7568944123fea74503836875dc65>:0 

This commit msg sucks because:

Frontend.XF.GTK: exit with one when user is root

With "one"? are you serious???? What is "one"??? Sigh. Please say exitCode different than zero, or something like that.
And also update PR title and description whenever you change commit msg!!

update.go:85: cannot change mount namespace according to change mount (/snap/gtk-common-
themes/1534/share/gtk2/Materia-compact /snap/geewallet/x1/data-dir/themes/Materia-compact none bind,ro 0 0): cannot
write to "/snap/gtk-common-themes/1534/share/gtk2/Materia-compact" because it would affect the host in "/snap"
update.go:85: cannot change mount namespace according to change mount (/snap/gtk-common-
themes/1534/share/gtk2/Materia-dark-compact /snap/geewallet/x1/data-dir/themes/Materia-dark-compact none bind,ro 0
0): cannot write to "/snap/gtk-common-themes/1534/share/gtk2/Materia-dark-compact" because it would affect the host
in "/snap"
update.go:85: cannot change mount namespace according to change mount (/snap/gtk-common-themes/1534/share/gtk2/Yaru-MATE-dark /snap/geewallet/x1/data-dir/themes/Yaru-MATE-dark none bind,ro 0 0): cannot use "/snap/gtk-common-themes/1534/share/gtk2/Yaru-MATE-dark" as bind-mount source: not a directory
update.go:85: cannot change mount namespace according to change mount (/snap/gtk-common-themes/1534/share/gtk2/Yaru-MATE-light /snap/geewallet/x1/data-dir/themes/Yaru-MATE-light none bind,ro 0 0): cannot use "/snap/gtk-common-themes/1534/share/gtk2/Yaru-MATE-light" as bind-mount source: not a directory
mkdir: cannot create directory ‘/run/user/0’: Permission denied
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
realpath: '': No such file or directory
Authorization required, but no authorization protocol specified

(geewallet:5797): Gtk-WARNING **: 09:01:13.760: cannot open display: :0

I think the majority of this gibberish that you pasted above is ALSO being printed when the user is not root, so please TRIM the gibberish to only the important error that makes this shit crash.

If you rerun the CI, it will be green. ty 🙏