Fix nginx configuration by properly escaping nginx variables

nginx/app.conf.template

@@ -7,7 +7,7 @@ server {
     }
     
     location / {
-        return 301 https://$host$request_uri;
+        return 301 https://$$host$$request_uri;
     }
 }
 
@@ -23,9 +23,9 @@ server {
     
     location / {
         proxy_pass http://web:8000;
-        proxy_set_header Host $host;
-        proxy_set_header X-Real-IP $remote_addr;
-        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Host $$host;
+        proxy_set_header X-Real-IP $$remote_addr;
+        proxy_set_header X-Forwarded-For $$proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $$scheme;
     }
 }