docs: update docs for minikube registry auth (#3986)

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Co-authored-by: Steffen Neubauer <[email protected]>

docs/k8s-plugins/local-k8s/install.md

@@ -58,6 +58,20 @@ Once Minikube and the appropriate driver for your OS are installed, you can star
 minikube start --vm-driver=<your vm driver>  # e.g. hyperkit on macOS
 ```
 
+If you are working in a team and need to use an external registry, you can [configure Garden with an external image registry](https://docs.garden.io/kubernetes-plugins/remote-k8s/configure-registry) such as ECR. Alternatively, you can enable Minikube's `registry-creds` addon, by following these steps:
+
+1.  Make sure Minikube is running by typing `minikube start`
+
+2.  Then run minikube `addons configure registry-creds`
+
+3.  Select applicable container registry 
+
+4.  Enter credentials
+
+5.  Make sure you run minikube `addons enable registry-creds`
+
+Minikube should now be able to authenticate with your chosen cloud provider.
+
 ### kind
 
 For kind installation instructions, see the [official docs](https://kind.sigs.k8s.io/docs/user/quick-start/).