add `router_role` var into `promote_p_to_pe`

geant/gap_ansible/roles/promote_p_to_pe/vars/main.yml

@@ -2,6 +2,7 @@
 # vars file for promote_p_to_pe
 is_pe_promotion_wf: true
 dry_run: true
+
 verbs:
   - set_isis_overload # Drain traffic to/from the router by setting ISIS overload
   - remove_isis_overload # Remove overload bit from ISIS config
@@ -13,3 +14,5 @@ verbs:
 
 lo_ipv4_address: "{{ subscription.router.router_lo_ipv4_address }}"
 lo_ipv6_address: "{{ subscription.router.router_lo_ipv6_address }}"
+router_tier: "{{ subscription.router.router_site.site_tier }}"
+router_role: "{{ subscription.router.router_role }}"