pmbootstrap tries to build some packages meant for the device for the host architecture
I'm not sure what the exact reproducer for this is, but it seems to be a regression from 8b0dfe48. I've seen people in the chat report this bug and I also encountered it myself in the boot-deploy CI. I don't know why the aforementioned commit causes it, but I wonder if it's worth reverting it in the meantime because this seems like a pretty serious issue given that it prevents people from build images.