fix(keycloak): Run keycloak on control plane (#630)

Co-authored-by: okozachenko1203 <okozachenko1203@users.noreply.github.com>
Co-authored-by: Mohammed Naser <mnaser@vexxhost.com>
diff --git a/roles/keycloak/vars/main.yml b/roles/keycloak/vars/main.yml
index 981c98e..a97c474 100644
--- a/roles/keycloak/vars/main.yml
+++ b/roles/keycloak/vars/main.yml
@@ -66,3 +66,5 @@
     timeoutSeconds: 1
     failureThreshold: 6
     successThreshold: 1
+  nodeSelector:
+    openstack-control-plane: enabled