Use $remote_scheme to correctly set the HTTP protocol the client is used

[rooftopcellist]

Resolves: #155

This PR modifies the nginx configmap to use $remote_scheme to correctly set the HTTP protocol the client is used.

cc @kurokobo

[Alex-Izquierdo]

This map is intended to use $remote_scheme instead of $scheme, don't?

[kurokobo]

Thanks for working on this too!
@Alex-Izquierdo is correct, these are suggested changes:

             location ~ ^/api/eda/v[0-9]+/ {
                 proxy_pass http://{{ ansible_operator_meta.name }}-api:8000;
                 proxy_set_header Origin http://{{ ansible_operator_meta.name }}-api:8000;
                 proxy_set_header Host $http_host;
                 proxy_set_header X-Forwarded-Host $host;
-                proxy_set_header X-Forwarded-Proto $scheme;
+                proxy_set_header X-Forwarded-Proto $remote_scheme;
                 proxy_set_header X-Forwarded-Port $server_port;
                 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             }

             location / {
                 # Redirect all traffic from root to /eda/
-                return 301 $scheme://$host/eda/;
+                return 301 $remote_scheme://$host/eda/;
             }

[rooftopcellist]

Thanks to both of you! I made those changes and tested this out and I can still access the UI at eda/, and it redirects properly. Thanks!

[Alex-Izquierdo]

@jamesmarshall24 I think this is a nice enhancement to bring up also in the installer.