nginx: Add config for 404 page.

Dockerfile

@@ -2,3 +2,4 @@ FROM klakegg/hugo:onbuild AS hugo
 
 FROM nginx:alpine-slim
 COPY --from=hugo /target /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/nginx.conf

nginx.conf

@@ -0,0 +1,16 @@
+
+user  nginx;
+worker_processes  auto;
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+events {
+    worker_connections  1024;
+}
+http {
+    server {
+        root /usr/share/nginx/html;
+        location / {
+            error_page 404 /404.html;
+        }
+    }
+}