Deploying Knot.x with Starter-Kit approach

**Describe the solution you'd like**
Starter-kit can build a Docker image. However, there are no examples or guidelines how to deal with Knot.x when deploying it in form of a Docker container. The questions are:
- How to build a knotx-based application so that it is ready to be deployed on Docker Swarm or Kubernetes.
- How to separate application and environment-specific configuration.
- How to validate the image and its logic before deploying.

**Additional context**
One of ideas is to do a series of examples with tutorials, on how to deploy Knot.x instance on swarm/k8s clusters, how to deal with configuration and how to separate it form the application.

Start from how Starter-Kit builds a Docker image and map the deployment questions to Docker Swarm and Kubernetes. Done means providing examples or guidelines for deployment, separating application and environment-specific configuration, and validating the image and its logic before deployment.

Written by the indexing model from the issue text.