doc: Update deployment docs

Signed-off-by: Christopher Lepski <[email protected]>

Author: clepski

docs/DEPLOYMENT.md

@@ -1,6 +1,18 @@
 # Deployment of CoMPAS
 We deploy the (native) Docker image of all CoMPAS services to Docker Hub. This way, it can be pulled and deployed into environments of your choice (OpenShift for example).
 
+## Deploy demo environment
+
+The [compas deployment repository](https://github.com/com-pas/compas-deployment) contains the deployment definition and workflow. To deploy a new version follow these steps.
+
+1. Create a new branch and update the relevant Docker image tags to the new versions in `compas/docker-compose-postgresql.yml`
+
+2. Create a pull request from your branch and request a review from one of the contributors.
+
+3. Once the pipeline passed and the PR is approved, merge it.
+
+4. Merging the PR triggers the deployment process via Github Actions. Visit http://demo.compas.energy to confirm the new version is deployed and functioning correctly.
+
 ## Quick Deployment instructions (under construction)
 The following instructions are terminal instructions for publishing a Quarkus docker image to Docker Hub. This should be done by a GitHub Action in the future.
 
@@ -22,4 +34,4 @@ Few points in this single command:
 
 # Sources
 
-[Full documentation about deploying Quarkus application to Docker Hub](https://dev.to/marcuspaulo/tutorial-publish-a-quarkus-application-in-kubernetes-minikube-and-dockerhub-36nd)
+[Full documentation about deploying Quarkus application to Docker Hub](https://dev.to/marcuspaulo/tutorial-publish-a-quarkus-application-in-kubernetes-minikube-and-dockerhub-36nd)