Docker hub images are not compiled multi platform

[cln-io]

Hi!

I encountered an issue while trying to set this up on a Swarm using the aarch64 architecture, as the Docker image doesn't appear to support multi-platform out of the box.

It might be handy for others if your image was multi platform 🤗

git clone https://github.com/granlem/docker-volume-sync.git
cd docker-volume-sync/image
docker build --platform linux/amd64,linux/arm64 . -t volume-sync:latest
docker tag volume-sync:latest granlem/volume-sync:latest
docker login --username granlem
docker push granlem/volume-sync:latest

This should allow the image to run on multiple platforms.