Hm, we are having a high number of docker failures too:
- https://gitlab.gnome.org/GNOME/gnome-build-meta/-/jobs/1121647
- https://gitlab.gnome.org/GNOME/gnome-build-meta/-/jobs/1122546
- https://gitlab.gnome.org/GNOME/gnome-build-meta/-/jobs/1122546
So maybe it is a CI problem. Or maybe problems on both ends coincidentally at the same time.