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docker build --platform linux/amd64

alternatively:

docker buildx build --platform linux/arm64,linux/amd64 # or whatever you need to target...

Yeah i have used this. It’s about 10x slower though. For instance unit tests that took 2 minutes on mac take almost 20 minutes.

Good for one off testing but not a full solution

I’d assume it’s no different than cross-compiling on amd64 to arm64. At least it’s possible.