deploy: route frontend and core through one origin

docker/nginx.conf.template

@@ -3,20 +3,16 @@ server {
     server_name _;
     root /usr/share/nginx/html;
 
-    location = /config.js {
-        add_header Cache-Control "no-store";
-        try_files $uri =404;
-    }
-
     location = /health {
-        proxy_pass http://core:8787/health;
+        proxy_pass ${THT_FRONTEND_API_UPSTREAM}/health;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_cache off;
     }
 
     location /api/ {
-        proxy_pass http://core:8787/;
+        # The trailing slash replaces the matched /api/ prefix before the private hop.
+        proxy_pass ${THT_FRONTEND_API_UPSTREAM}/;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
@@ -27,7 +23,7 @@ server {
         proxy_set_header X-Authenticated-User $http_x_authenticated_user;
         proxy_buffering off;
         proxy_cache off;
-        proxy_read_timeout 1h;
+        proxy_read_timeout 3600s;
     }
 
     location / {