Merge pull request 'define forwarded_scheme before use' (!71) from bugfix/pass-scheme-to-fastcgi into master

Reviewed-on: #71

docker/configs/nginx.conf

@@ -1,3 +1,9 @@
+map $http_x_forwarded_proto $forwarded_scheme {
+        default $scheme;
+        http http;
+        https https;
+}
+
 server {
         listen 80 default_server;
         listen [::]:80 default_server;