fastcgi https enforcement

required to avoid an extra https->http->https redirect, should increase
performance and allow use without the need to open port 80

group_vars/seafile.yaml

@@ -129,7 +129,7 @@ nginx_sites:
        "fastcgi_param SERVER_ADDR":         $server_addr
        "fastcgi_param SERVER_PORT":         $server_port
        "fastcgi_param SERVER_NAME":         $server_name
-       "fastcgi_param HTTPS":               on
+       "fastcgi_param HTTPS":               $https
        "fastcgi_param HTTP_SCHEME":         https
        access_log:    /var/log/nginx/seahub.access.log
        error_log:     /var/log/nginx/seahub.error.log