Update developer-mode-installation.md

Added note that RKE2/Rancher have to be fully up before continuing with next steps.

docs/developer/developer-mode-installation.md

@@ -58,16 +58,19 @@ You can install Harvester on an [RKE2](https://docs.rke2.io/) cluster using the
     sudo cp /etc/rancher/rke2/rke2.yaml ~/.kube/config
     sudo chown $(id -u):$(id -g) ~/.kube/config
     ```
+:::info note
+Wait until RKE2 will be fully up (all pods in `kube-system` namespace will be running) before continuing with next steps.
+:::
+
+:::info note
+If you are unable to locate the `kubectl` binary in `/usr/local/bin`, check `/var/lib/rancher/rke2/bin`.
+:::
 
 1. Install system-upgrade-controller. This Kubernetes-native upgrade controller for nodes installs `upgrade.cattle.io/v1` CRDs.
     ```bash
     kubectl apply -f https://github.com/rancher/system-upgrade-controller/releases/download/v0.13.1/system-upgrade-controller.yaml
     ```
 
-:::info note
-If you are unable to locate the `kubectl` binary in `/usr/local/bin`, check `/var/lib/rancher/rke2/bin`.
-:::
-
 1. Create the cattle-system namespace.
     ```bash
     kubectl create ns cattle-system
@@ -92,6 +95,10 @@ If you are unable to locate the `kubectl` binary in `/usr/local/bin`, check `/va
     --set bootstrapPassword=admin
     ```
 
+:::info note
+Wait until Rancher will be fully up (all pods in `cattle-system` namespace will be running) before continuing with next steps.
+:::
+
 1. Clone the `rancher/charts` repository.
     ```bash
     git clone https://github.com/rancher/charts -b dev-v2.7