Reverted buildx image back to binfmt (#138)

This PR reverts the `buildx` base image back to using `binfmt` because
`binfmt` supports building both ARM and x86 images directly and does not
require additional binaries like `alpine` does.

Note that `binfmt` does NOT support building images from ARM machines
(e.g. Apple Silicon or RPis), so the build script will need to be ran on
x86 machines (e.g. AWS EC2).

deploy/bin/build-push-edge-endpoint-image.sh

@@ -55,7 +55,7 @@ fi
 # https://docs.docker.com/engine/install/ubuntu/
 
 # Install QEMU, a generic and open-source machine emulator and virtualizer
-docker run --rm --privileged linuxkit/alpine:146f540f25cd92ec8ff0c5b0c98342a9a95e479e
+docker run --rm --privileged linuxkit/binfmt:af88a591f9cc896a52ce596b9cf7ca26a061ef97
 
 # Check if tempbuilder already exists
 if ! docker buildx ls | grep -q tempgroundlightedgebuilder; then