add some notes for local testing

helm/nessie/README.md

@@ -46,6 +46,16 @@ From Nessie repo root:
 $ helm install --namespace nessie-ns nessie helm/nessie
 ```
 
+#### Local Helm chart using a locally built Nessie image
+
+Running minikube with a locally built image is a bit more complex:
+1. Add the `registry` addon to `minikube` using `minikube addons enable registry`
+2. Allow using an insecure registry using `minikube config set insecure-registry "$(minikube ip)"`
+3. Build the image using `tools/dockerbuild/build-push-images.sh -g :nessie-quarkus -p servers/quarkus-server projectnessie/nessie-local -l -t podman`
+4. Push the image using `podman push --tls-verify=false localhost/projectnessie/nessie-local:latest docker://$(minikube ip):5000/projectnessie/nessie-local:latest`
+5. Use the following Helm values: `image.repository=192.168.49.2:5000/projectnessie/nessie-local:latest` and `image.pullPolicy=Always`
+6. Install the Helm chart as described above
+
 ### Uninstalling the chart
 
 ```bash