HOWTO configure docker buildx to be able to build multi-archi images in Linux

docker-multi-arch-linux.md

Multi-architecture docker builds on Linux

Install binfmt if ls /proc/sys/fs/binfmt_misc/qemu* returns nothing:

docker run --privileged --rm tonistiigi/binfmt --install all

Verify that it worked, you should see stuff by running ls /proc/sys/fs/binfmt_misc/qemu*

Create a new buildx builder:

docker buildx create \
  --name container-builder \
  --driver docker-container \
  --bootstrap --use