TCK for ActionProtocol

[marcellanz]

I think we could start to work on the TCK. We start with the action protocol, find a way to run TCK tests. We can use any of the TCK user functions already implemented.

Topics to work on

• [ ] provide dedicated docker image with the action protocol. There is already gcr.io/eigr-io/eigr-go-tck-action but we might separate them also by code as this image was done ad-hoc.
• [ ] implement a testkit like runner like in CS https://github.com/eigr-labs/cloudstate/blob/16ea6f8f17c8f8b5959e626dc4e9808d9288dae6/tck/src/main/scala/io/cloudstate/tck/ActionTCK.scala#L29
• [ ] establish a nightly run for the TCK with some reports