Build ARM64 images with buildx

build-it.sh

# See https://docs.docker.com/buildx/working-with-buildx
# Here I'm on macOS (11.6.5)
# and using Docker Desktop (4.7.1)

# Multi-architecture build (Docker Desktop)
# Create an isolated buildx instance...
docker buildx create --name mybuilder
docker buildx use mybuilder

# Build something for amd64 and arm64...
# Maybe the Informatics Matters Data Manager Kubernetes Job Operator (a public image)
# An example of simply creating the image locally,
# and one where the image is pushed to DockerHub...
docker buildx build --platform linux/amd64,linux/arm64 --tag informaticsmatters/data-manager-job-operator:latest --output type=image .
docker buildx build --platform linux/amd64,linux/arm64 --tag informaticsmatters/data-manager-job-operator:latest --output type=registry .
# You can replace "--output type=registry" with the shorthand option "--push"

# Inspect pushed images (to see supported architectures)...
docker buildx imagetools inspect informaticsmatters/data-manager-job-operator:latest

# When you're done building
# remove the buildx builder instance...
docker buildx rm mybuilder