Add make command for running the app in an HA topology (#16702)

* Add make command for running the app in an HA topology

* Tidy up conf files, remove unnecessary commands and add restart-haserver command

* Use the right flag for checking enterprise folder presence before ha setup

build/docker/nginx/default.conf

@@ -0,0 +1,35 @@
+upstream app_cluster {
+  server leader:8065 fail_timeout=5s max_fails=10;
+  server follower:8065 fail_timeout=5s max_fails=10;
+}
+
+server {
+  listen 8065;
+
+  location ~ /api/v[0-9]+/(users/)?websocket$ {
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    client_max_body_size 50M;
+    proxy_set_header Host $http_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 X-Frame-Options SAMEORIGIN;
+    proxy_buffers 256 16k;
+    proxy_buffer_size 16k;
+    proxy_read_timeout 600s;
+    proxy_pass http://app_cluster;
+  }
+
+  location / {
+    client_max_body_size 50M;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    proxy_set_header Host $http_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 X-Frame-Options SAMEORIGIN;
+    proxy_pass http://app_cluster;
+  }
+}