Add Cadence Samples: Dockerfile, Deployment YAML, and Usage Guide

[CosminL-DEV]

This PR introduces a comprehensive set of examples for running and testing Cadence workflows using containers in Kubernetes. It includes:

• A specialized Dockerfile (Dockerfile.samples) to build images with Cadence samples.
• A Kubernetes YAML file (cadence-samples-pod.yaml) for easy test pod deployment.
• A detailed usage guide (README.md) with instructions for:
  • Registering the domain in Cadence.
  • Building and pushing the image to your registry.
  • Deploying the pod on Kubernetes.
  • Running and testing sample workflows (Hello World, File Processing, DSL).
  • Links to additional documentation and source code.

These additions make it easier to validate, learn, and automate workflow tests in Kubernetes environments.

[taylanisikdemir]

Thanks for dockerizing this. We can do this in the samples repo and have CI to push image to dockerhub. This way, chart users can simply use it and avoid bunch of steps. I will track this separately.

[CosminL-DEV]

@taylanisikdemir I created a new PR in cadence-samples. We can keep this one here until the versioning and official Docker Hub image are ready, and then we can add the cadence-samples pod deployment to the examples folder once it's complete.

[taylanisikdemir]

@taylanisikdemir I created a new PR in cadence-samples. We can keep this one here until the versioning and official Docker Hub image are ready, and then we can add the cadence-samples pod deployment to the examples folder once it's complete.

Sounds good. Let's add a TODO in the README file about this and link cadence-workflow/cadence-samples#94