Update docker-image.yml

[gregcar]

Added support for building arm64 platform container image

Resolves N/A Type: feature

Issue

Unable to use grandnode/grandnode2 docker hub hosted container image (linux/amd64 platform) on MAC M series silicon or anything else running ARM. These changes address that by creating an additional OS/ARCH image during build and pushing it to docker hub.

Solution

Updates are isolated to GH action docker-image.yml:

• Added QEMU
• Moved setup-buildx-action to v2.
• Specified build platforms: linux/amd64,linux/arm64

Breaking changes

N/A

Testing

1. Execute Action run for Docker Image CI
2. Validate that new 'linux/arm64' OS/ARCH has been added to 'latest' in grandnode/grandnode2 docker hub image
3. Test creation of container on ARM based machine

[KrzysztofPajak]

@gregcar Thank you for contributing