Issue #3273962 by onotm, yas: Add instructions to deploy Cloud Orchestrator on a K8s cluster

deployments/kubernetes/README.md

+USAGE INSTRUCTIONS
+==================
+
+**1. Build a Cloud Orchestrator image**
+
+```
+$ git clone https://git.drupalcode.org/project/cloud.git
+$ cd cloud/deployments/kubernetes
+$ docker image build -t cloud_orchestrator:latest .
+```
+
+**2. Push the image to your Docker repository**
+
+```
+$ docker image tag cloud_orchestrator:latest your/repository:latest
+$ docker image push your/repository:latest
+```
+
+**3. Edit `cloud_orchestrator.yml`**
+
+* [Line 18- 24](https://git.drupalcode.org/project/cloud/-/blob/5.x/deployments/kubernetes/cloud_orchestrator.yml#L18-24): Set your usernames, passwords, e-mail address and database name
+* [Line 113](https://git.drupalcode.org/project/cloud/-/blob/5.x/deployments/kubernetes/cloud_orchestrator.yml#L113): Set `your/repository:latest`
+
+**4. Apply `cloud_orchestrator.yml` to your K8s cluster**
+
+```
+$ kubectl apply -f cloud_orchestrator.yml
+```
+
+**5. (Optional) Add a load balancer to access Cloud Orchestrator from your browser**
+
+If you are using EKS, you can add a load balancer to access Cloud Orchestrator
+from your browser as follows. Initially, this load balancer accepts all inbound
+traffic. To restrict access to Cloud Orchestrator, change the security group
+associated with that load balancer.
+
+```
+$ kubectl expose service cloud_orchestrator  \
+    --namespace=cloud_orchestrator  \
+    --type=LoadBalancer  \
+    --name=cloud_orchestrator-lb
+```
+
+**6. Remove Cloud Orchestrator from your K8s cluster**
+
+```
+$ kubectl delete -f cloud_orchestrator.yml
+```
+
+`cloud_orchestrator.yml` installs Cloud Orchestrator and stores MariaDB database
+on a filesystem of one of the K8s nodes via PersistentVolumes of the type
+hostPath. When these PersistentVolumes are deleted, files stored in the node's
+filesystem are NOT deleted. If you want to delete them, log in to the node and
+execute the following command:
+
+* Cloud Orchestrator
+  - `rm -r /var/www/cloud_orchestrator`
+* MariaDB
+  - `rm -r /var/cloud_orchestrator/mysql`