An Amazon AWS EC2 instance may be used to build ARM64 snaps.

1. Launch an Amazon EC2 Ubuntu 18.04 ARM64 instance.
2. Update the instance:
       sudo apt update
    sudo apt upgrade -y
3. Configure the build environment:
       sudo apt install build-essential -y
    export SNAPCRAFT_BUILD_ENVIRONMENT=host
4. Follow the Ubuntu: Create your first snap tutorial to create and run your first snap.

References

• Ubuntu: Create your first snap
• Snapcraft: The Snapcraft Build Environment Variable