Merge pull request 'aggiunt header forwarded proto https' (!3) from marco.procaccini/ansible-role-docker-swarm:master into master

Reviewed-on: #3

templates/haproxy.cfg.j2

@@ -142,6 +142,7 @@ frontend http
     option forwardfor
     # HSTS (63072000 seconds)
     http-response set-header Strict-Transport-Security max-age=63072000
+    http-request set-header X-Forwarded-Proto https if { ssl_fc }
     # Remove the port from the host endpoint.
     http-request replace-value Host (.*):.* \1
 {% if docker_swarm_cluster_portainer_install %}