Add a pre-defined server for the docker version (#413)

* Moved build to docker stage.

* Do not copy node_modules to the docker image

* Optimize Docker builds

* Lock a predefined server with enviroment variables

* Added a example docker compose file

* Removed useless layer

* Fix error with empty server type

* pass process via preload, use file, strict server check

* remove duplicate content-type

* update readme, docker compose

* bugfix: server lock false, not jellyfin

* fix preload type definition

* fix docker, web server lock check

---------

Co-authored-by: Kendall Garner <17521368+kgarner7@users.noreply.github.com>

ng.conf.template

@@ -16,4 +16,12 @@ server {
     alias /usr/share/nginx/html/;
     try_files $uri $uri/ /index.html =404;
   }
+
+  location ${PUBLIC_PATH}settings.js {
+    alias /etc/nginx/conf.d/settings.js;
+  }
+
+  location ${PUBLIC_PATH}/settings.js {
+    alias /etc/nginx/conf.d/settings.js;
+  }
 }