Create Dockerfile and add to CI

[twarit-waikar]

p4-fusion is being built inside an alpine container and then shipped. We should ensure p4-fusion still builds in alpine when we create new releases. Our current CI process only builds p4-fusion on Ubuntu

The best way to do that is to create a Dockerfile that builds p4-fusion and the add a Github Action that builds using that Dockerfile.

https://docs.github.com/en/actions/creating-actions/creating-a-docker-container-action