fix nginx append slash to respect proxy

This is already fixed in awx-operator.
See https://github.com/ansible/awx-operator/blob/a534c856dbebc853191fb2547346007a60f137db/roles/installer/templates/configmaps/config.yaml.j2#L215
This just makes it so a development environment can also work correctly
behind a proxy

Fixes problem of
GET to https://$PROXY/something/awx/v2/me
rewritten to https://$AWX/something/awx/v2/me/ (which doesn't exist)

instead path is correctly rewritten as https://$PROXY/something/awx/v2/me/

tools/docker-compose/ansible/roles/sources/templates/nginx.locations.conf.j2

@@ -34,7 +34,7 @@ location {{ (ingress_path + '/websocket').replace('//', '/') }} {
 
 location {{ ingress_path }} {
     # Add trailing / if missing
-    rewrite ^(.*[^/])$ $1/ permanent;
+    rewrite ^(.*)$http_host(.*[^/])$ $1$http_host$2/ permanent;
     uwsgi_read_timeout 120s;
     uwsgi_pass uwsgi;
     include /etc/nginx/uwsgi_params;