feat: add uffizzi usage docs

docs/build-customize-contribute/uffizzi-virtual-clusters.md

@@ -0,0 +1,32 @@
+---
+title: Using Uffizzi virtual cluster ephemeral environments
+---
+
+When a pull request is opened against the [main goharbor/harbor GitHub repository](https://github.com/goharbor/harbor), a GitHub action workflow will trigger the creation of a [Uffizzi Virtual Cluster](https://www.uffizzi.com) ephemeral environment. This environment is a Kubernetes cluster where Harbor will be built and deployed from the changes in the pull request.
+
+The ingress to the frontend for harbor will also be available in a comment posted by the github action. To log into the instance of harbor use the following credentials :- 
+
+```
+username: admin
+password: Harbor12345
+```
+
+To access the kubernetes cluster you will have to log into Uffizzi from the CLI. For this you will have to install the `uffizzi` cli tool which can be installed from [here](https://docs.uffizzi.com/install/).
+
+Once you have installed the CLI follow the steps below to access the ephemeral kubernetes cluster for your PR.
+
+1. Login to Uffizzi, then select the `harbor` account and project:
+```
+uffizzi login
+```
+
+```
+Select an account: 
+    ‣ ${{ github.event.repository.name }}
+    jdoe
+
+Select a project or create a new project: 
+    ‣ ${{ github.event.repository.name }}-6783521
+```
+2. Update your kubeconfig: `uffizzi cluster update-kubeconfig pr-<pr-number> --kubeconfig=[PATH_TO_KUBECONFIG]`
+After updating your kubeconfig, you can manage your cluster with `kubectl`, `kustomize`, `helm`, and other tools that use kubeconfig files: `kubectl get namespace --kubeconfig [PATH_TO_KUBECONFIG]`