(cherry-pick) Fix flaky arm64 emulator issue docker/buildx#542

hack/init-buildx.sh

@@ -50,6 +50,15 @@ if ! grep -q "^Driver: docker$"  <<<"${current_builder}" && \
   exit 0
 fi
 
+# Ensure qemu is in binfmt_misc
+# Docker desktop already has these in versions recent enough to have buildx
+# We only need to do this setup on linux hosts
+if [ "$(uname)" == 'Linux' ]; then
+  # NOTE: this is pinned to a digest for a reason!
+  # https://github.com/docker/buildx/issues/542#issuecomment-778835576
+  docker run --rm --privileged tonistiigi/binfmt --uninstall qemu-aarch64 && docker run --rm --privileged tonistiigi/binfmt --install arm64 
+  docker run --rm --privileged tonistiigi/binfmt
+fi
 
 # Ensure we use a builder that can leverage it (the default on linux will not)
 docker buildx rm ingress-nginx || true