Add better cache policies to docker image

Dockerfile

@@ -1,3 +1,3 @@
 FROM nginx
 ADD public /usr/share/nginx/html
-ADD nginx.conf /etc/nginx/conf.d/default.conf
+ADD nginx.conf /etc/nginx/nginx.conf

nginx.conf

@@ -1,19 +1,70 @@
-server {
-    listen       80;
-    server_name  vikunja.io;
+user  nginx;
+worker_processes  1;
 
-    charset utf-8;
+error_log  /var/log/nginx/error.log warn;
+pid        /var/run/nginx.pid;
 
-    location / {
-        root   /usr/share/nginx/html;
-        index  index.html index.htm;
+events {
+    worker_connections  1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+    #tcp_nopush     on;
+
+    keepalive_timeout  65;
+
+    gzip  on;
+    gzip_disable "msie6";
+
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_buffers 16 8k;
+    gzip_http_version 1.1;
+    gzip_min_length 256;
+    gzip_types text/plain text/css application/json application/x-javascript application/javascript text/xml application/xml application/xml+rss text/javascript application/vnd.ms-fontobject application/x-font-ttf font/opentype image/svg+xml font/woff2 image/x-icon;
+
+    # Expires map
+    map $sent_http_content_type $expires {
+        default                    off;
+        text/html                  epoch; # We don't cache the html for the browser to get the content
+        text/css                   max;
+        application/javascript     max;
+        ~image/                    max;
+        ~font/                     max;
     }
 
-    rewrite ^/en/(.*)$ https://$server_name/$1 redirect;
+    server {
+        listen 80;
+        listen 81  default_server http2 proxy_protocol; ## Needed when behind HAProxy with SSL termination + HTTP/2 support
 
-    error_page 404 /404.html;
-    error_page 500 502 503 504  /50x.html;
-    location = /50x.html {
-        root   /usr/share/nginx/html;
+        server_name vikunja.io;
+
+        expires $expires;
+
+	    charset utf-8;
+
+        location / {
+            root   /usr/share/nginx/html;
+            index  index.html index.htm;
+        }
+
+	    rewrite ^/en/(.*)$ https://$server_name/$1 redirect;
+
+	    error_page 404 /404.html;
+	    error_page 500 502 503 504  /50x.html;
+	    location = /50x.html {
+	        root   /usr/share/nginx/html;
+	    }
     }
 }