correct sparse checkout and add small installation section for controller to cliff.toml

On-behalf-of: Gerald Morrison (SAP) <gerald.morrison@sap.com>
Signed-off-by: Gerald Morrison (SAP) <gerald.morrison@sap.com>

Author: morrison-sap

.github/workflows/kubernetes-controller.yml

@@ -68,6 +68,7 @@ jobs:
           sparse-checkout: |
             ${{ env.LOCATION }}
             Taskfile.yml
+            .env
           persist-credentials: false
 
       - name: Install Task
@@ -123,6 +124,7 @@ jobs:
             .github/scripts
             ${{ env.LOCATION }}
             Taskfile.yml
+            .env
           persist-credentials: false
           ref: ${{ env.REF }}
 
@@ -297,6 +299,7 @@ jobs:
           sparse-checkout: |
             ${{ env.LOCATION }}
             Taskfile.yml
+            .env
           persist-credentials: false
 
       - name: Install Task

kubernetes/controller/cliff.toml

@@ -20,9 +20,19 @@ body = """
     {% endfor %}
 {% endfor %}
 
-### Installation
+### Quick installation and usage guide
 
-TODO: Add controller-specific installation instructions here.
+To install the latest version of the OCM Controllers into an existing kubernetes cluster,
+you can use our Helm chart:
+
+```bash
+helm install ocm-k8s-toolkit oci://ghcr.io/open-component-model/charts/ocm-k8s-toolkit \
+  --namespace ocm-k8s-toolkit-system \
+  --create-namespace
+``
+
+Check out our [guide](https://ocm.software/dev/docs/getting-started/set-up-controller-environments/) on how to set up
+OCM Controller environments for more details.
 
 {% if github.contributors | length > 0 %}
 ### Community & Contributors