Add cache header for main website static resources

docker/korhonen.cc/nginx.conf

@@ -3,10 +3,16 @@ server {
     listen  [::]:80;
     server_name  localhost;
 
-    location / {
-        root   /korhonen.cc;
-        index  index.html;
-    }
+	location / {
+		root   /korhonen.cc;
+		index  index.html;
+
+		location ~* \.(?:css|js|jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
+			expires 1M;
+			access_log off;
+			add_header Cache-Control "public";
+		}
+	}
 
 	# Use hugo 404 page
     error_page 404 /404.html;