feat: show link to guardian for group access

Author: rahmatrhd

.env.example

@@ -27,3 +27,4 @@ GATE_VPN_SSL_PVTKEY=
 NEWRELIC_AGENT_ENABLED=false
 NEWRELIC_LICENSE_KEY=
 NEWRELIC_APP_NAME=Gate
+GATE_GUARDIAN_URL=

app/views/groups/show.html.slim

@@ -68,6 +68,11 @@
       br
       = "*This group does not have any group members" if @group_users.length == 0
       br
+      - if ENV['GATE_GUARDIAN_URL'].present?
+        p
+          | Raise access request in 
+          a href="#{ENV['GATE_GUARDIAN_URL']}" target="_blank" Guardian
+          |  to join this group
       - if current_user.admin
         .h7 Assign members
         = form_tag  add_user_to_group_path(@group.id), method: :post do