There is a huge file in the sdk
I still couldn't install the sdk from the import repo. It keeps giving me the error "Download incomplete". Trying to figure out the problem, I found it failed trying to download a 192MB file (compressed).
Trying to look at the runtimes I built, I found that
libjs_static.ajs from mozjs is 586M. We don't want this in the sdk (it's not in the old sdk, https://gitlab.gnome.org/GNOME/gnome-sdk-images/blob/master/org.gnome.Sdk.json.in#L747), and I don't think we need it at all.