Publish a docker image

[ciaranmcnulty]

I saw some chat on #784 and thought 'that doesn't seem hard'

Was done as lunch fun so I won't be offended if it's not used :)

[ciaranmcnulty]

You can see a successful run here in my fork https://github.com/ciaranmcnulty/json-formatter/actions/runs/2616825975

And the resulting multi-arch tags: https://hub.docker.com/repository/docker/ciaranmcnulty/json-formatter

For some reason the commits weren't signed so the hash for that build is different but I promise it's the same!

[iomedico-beyer]

Do you have an idea how I can use that container within these Cypress Docker images? They say “Error: spawn docker ENOENT”. I guess that means the Docker containers don’t know docker. Sorry, if this is a dumb question. I’m new to Docker.