Provide docker compose deployment for test purposes

[wey-gu]

I will port what had been done in https://github.com/wey-gu/nebula-up here

Before that you could try curl -fsSL nebula-up.siwei.io/all-in-one.sh | bash

or

curl -fsSL nebula-up.siwei.io/all-in-one.sh | bash -s -- v3 dashboard

To play with it!

tasks

• Create docker-compose files first relying on docker file to be built, this decouples the task of docker image build/push to docker hub before it's done. Add docker compose playground for dashboard #65
• Create GH actions to build and push images to the docker hub
• Refer GH images in compose file
• Documentations to be added