Reapply rate limiting fix after merge

Author: aequitas

docker/webserver/nginx_templates/app.conf.template

@@ -178,6 +178,9 @@ server {
 
         proxy_set_header REMOTE-USER $remote_user;
 
+        # forward client IP for rate limiting on tasks (see `redis_id.py` `req_limit`)
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
         include /etc/nginx/conf.d/basic_auth.include;
         # set proxy_pass argument for 'app' container as variable, this way nginx doesn't fail when 'app' is unresolvable at startup
         set $app http://app:8080;
@@ -217,6 +220,8 @@ server {
         # pass host for Django's allowed_hosts
         proxy_set_header Host $host;
         proxy_set_header X-Forwarded-Proto $scheme;
+        # forward client IP for rate limiting on tasks (see `redis_id.py` `req_limit`)
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         # set proxy_pass argument for 'app' container as variable, this way nginx doesn't fail when 'app' is unresolvable at startup
         set $app http://app:8080;
         proxy_pass $app;