chore: improve documentation (#2433)

- adds an example for external secret (how to use and create)
- adds notes on tolerations when the controlplane runs isolated

For: #2432

charts/openstack-cloud-controller-manager/Chart.yaml

@@ -4,7 +4,7 @@ description: Openstack Cloud Controller Manager Helm Chart
 icon: https://object-storage-ca-ymq-1.vexxhost.net/swift/v1/6e4619c416ff4bd19e1c087f27a43eea/www-images-prod/openstack-logo/OpenStack-Logo-Vertical.png
 home: https://github.com/kubernetes/cloud-provider-openstack
 name: openstack-cloud-controller-manager
-version: 2.29.0-alpha.3
+version: 2.29.0-alpha.4
 maintainers:
   - name: eumel8
     email: [email protected]

charts/openstack-cloud-controller-manager/README.md

@@ -21,12 +21,40 @@ If you want to enable health checks for your Load Balancers (optional), set `clo
 
 Then run:
 
-```
+```sh
 helm repo add cpo https://kubernetes.github.io/cloud-provider-openstack
 helm repo update
 helm install openstack-ccm cpo/openstack-cloud-controller-manager --values openstack-ccm.yaml
 ```
 
+## Using an external secret
+
+In order to use an external secret for the OCCM:
+
+```yaml
+secret:
+  enabled: true
+  name: cloud-config
+  create: false
+```
+
+Create the secret with:
+
+```sh
+kubectl create secret -n kube-system generic cloud-config --from-file=./cloud.conf
+```
+
+## Tolerations
+
+To deploy OCCM to worker nodes only (e.g. when the controlplane is isolated), adjust the tolerations in the chart:
+
+```yaml
+tolerations:
+  - key: node.cloudprovider.kubernetes.io/uninitialized
+    value: "true"
+    effect: NoSchedule
+```
+
 ## Unsupported configurations
 
 - The chart does not support the mounting of custom `clouds.yaml` files. Therefore, the following config values in the `[Global]` section won’t have any effect: