Raspberry Pi exec format error -out-of-nowhere-

since the weekend all my attempts at building in Dockerfiles which were good now fail

“The requested image’s platform (linux/arm64/v8) does not match the detected host platform (linux/arm/v7) and no specific platform was requested”

(NB this is not some bit of cross-wiring to amd64 images, both these are ARM )
and sure enough

I will probably see a exec format error on the next line

The dockerfiles were good when I last built them back in the New Year so something has changed out there

I did try prefixing my build commands with


and have updated my apt packages

Further clarification, it seems that the problem containers are all GO based. I’ll take this enquiry over to another platform