installer: create namespaces with kube client
diff --git a/core/installer/values-tmpl/cert-manager-webhook-gandi.yaml b/core/installer/values-tmpl/cert-manager-webhook-gandi.yaml
index fdcc030..bbadd91 100644
--- a/core/installer/values-tmpl/cert-manager-webhook-gandi.yaml
+++ b/core/installer/values-tmpl/cert-manager-webhook-gandi.yaml
@@ -2,12 +2,11 @@
 kind: HelmRelease
 metadata:
   name: cert-manager-webhook-gandi
-  namespace: {{ .Global.PCloudEnvName }}
+  namespace: {{ .Global.PCloudEnvName }}-cert-manager
 spec:
-  targetNamespace: {{ .Global.PCloudEnvName }}-cert-manager
   dependsOn:
     - name: cert-manager
-      namespace: {{ .Global.PCloudEnvName }}
+      namespace: {{ .Global.PCloudEnvName }}-cert-manager # TODO(giolekva): derivative
   chart:
     spec:
       chart: charts/cert-manager-webhook-gandi