staircase 0.0.7

Kubernetes Step-based Operator
Documentation 
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# run this elevator-operator as an example:

1. open a cli and start a k8s cluster
```
cd staircase/example;
docker compose up -d;
```

2. use the `KUBECONFIG`
```
export KUBECONFIG=$(pwd)/kubeconfig.yaml
```

3. start operator in background (or other cli)
```
cargo run --example=elevator-operator --all-features
```

4. create a instace of an elevator:
```
kubectl apply -f elevator.yaml
```

5. port-forward the service to local system
```
kubectl port-forward service/sample-elevator-elevator 8080:80
```

6. open [localhost](http://localhost:8080/)

7. modify the elevator crd:
```
kubectl edit elevators.example.com sample-elevator
```