Feature 8170: Add cert-manager installation as part of helm-based OSM installation

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

03-installing-osm.md

@@ -584,6 +584,17 @@ juju add-model osm k8scloud
 juju deploy ch:mongodb-k8s -m osm
 ```
 
+### Deploy Cert-manager
+
+```bash
+CERTMANAGER_VERSION="v1.9.1"
+helm repo add jetstack https://charts.jetstack.io
+helm repo update
+helm install cert-manager --create-namespace --namespace cert-manager jetstack/cert-manager \
+    --version ${CERTMANAGER_VERSION} --set installCRDs=true --set prometheus.enabled=false \
+    --set clusterResourceNamespace=osm \
+    --set extraArgs="{--enable-certificate-owner-ref=true}"
+```
 ### Deploy OSM helm chart
 
 Get Juju host, secret, public key and CA certificate: