fix: use production URL for proxy pass

Related: #1997

Author: B4nan

.github/workflows/test.yaml

@@ -58,8 +58,9 @@ jobs:
                         include $(pwd)/nginx.conf;
                     }
                     EOF
+                    export DOCS_PROXY_TARGET=http://localhost:3000
                     mkdir -p $(pwd)/logs
-                    nginx -c $(pwd)/default.conf
+                    nginx -c $(pwd)/default.conf -g "env DOCS_PROXY_TARGET;"
                     sleep 1
 
             -   name: Run header assertions

nginx.conf

@@ -1,3 +1,8 @@
+map $DOCS_PROXY_TARGET $proxy_target {
+    default "https://apify.github.io/apify-docs/";
+    ""      "https://apify.github.io/apify-docs/";
+    "~^http" $DOCS_PROXY_TARGET;
+}
 map $http_accept $wants_markdown {
   default 0;
   "~*text/markdown" 1;
@@ -14,12 +19,12 @@ server {
       # use 'last' to force a new location lookup so /__proxy/ handler runs
       rewrite ^ /__proxy/llms.txt last;
     }
-    proxy_pass http://localhost:3000;
+    proxy_pass $DOCS_PROXY_TARGET;
   }
 
   # direct llms.txt files, serve with markdown content type
   location ~ ^/llms(-full)?\.txt$ {
-    proxy_pass http://localhost:3000;
+    proxy_pass $DOCS_PROXY_TARGET;
     proxy_hide_header Content-Type;
     add_header Content-Type "text/markdown; charset=utf-8" always;
   }
@@ -30,7 +35,7 @@ server {
       # rewrite to internal proxy path; use last so new location is matched
       rewrite ^(/[^.]+)$ /__proxy$1.md last;
     }
-    proxy_pass http://localhost:3000;
+    proxy_pass $DOCS_PROXY_TARGET;
   }
 
   # internal proxy handler that actually forces the markdown header
@@ -40,7 +45,7 @@ server {
     # strip the /__proxy prefix so upstream sees the real path
     rewrite ^/__proxy(/.*)$ $1 break;
 
-    proxy_pass http://localhost:3000;
+    proxy_pass $DOCS_PROXY_TARGET;
     proxy_hide_header Content-Type;
     add_header Content-Type "text/markdown; charset=utf-8" always;
   }