FR: Publish a linux/arm Docker image

[ilyagr]

This would make running gumtree on Darwin/ARM via Docker easier, e.g. not require Rosetta 2.

[pouryafard75]

I remember when I was trying to make linux/arm image for RefactroingMiner, I had to do this. I thought it might be helpful since the issue is posted.

[jrfaller]

Hi! We build the docker image using the buildx action (https://github.com/GumTreeDiff/gumtree/blob/main/.github/workflows/build-test-gumtree.yml) maybe we can configure the platform there?

Cheers!

[jrfaller]

There is now a arm64 image! Cheers.