Add Docker static site containerisation

This change adds Docker containerisation utilising a multi-stage build
Dockerfile. This leads to the static site being generated and served
through nginx.

.github/dependabot.yml

@@ -1,9 +1,17 @@
 version: 2
 updates:
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "docker"
+    labels:
+      - "dependencies"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "daily"
     commit-message:
       prefix: "github-actions"
     labels:

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:18.18.0-alpine AS build
+
+COPY . .
+
+RUN apk update && apk upgrade && \
+    apk add --no-cache git
+
+RUN npm ci --omit=dev
+RUN npm run build
+
+FROM nginx:1.25.2-alpine
+
+COPY --from=build /_site /usr/share/nginx/html
+COPY --from=build /nginx/nginx.conf /etc/nginx/nginx.conf
+
+USER 1000
+
+CMD ["/usr/sbin/nginx", "-g", "daemon off;"]

nginx/nginx.conf

@@ -0,0 +1,47 @@
+worker_processes  1;
+
+error_log  /var/log/nginx/error.log warn;
+pid        /tmp/nginx.pid;
+
+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;
+
+    keepalive_timeout       10;
+    send_timeout            10;
+    server_tokens           off;
+    client_body_timeout     10;
+    client_header_timeout   10;
+    client_max_body_size    100K;
+
+    server {
+        listen       80;
+        root         /usr/share/nginx/html;
+
+        location / {
+          try_files $uri $uri/ $uri.html =404;
+        }
+
+        error_page  404              /404.html;
+        error_page  500 502 503 504  /50x.html;
+    }
+
+    client_body_temp_path /tmp/client_temp;
+    proxy_temp_path       /tmp/proxy_temp_path;
+    fastcgi_temp_path     /tmp/fastcgi_temp;
+    uwsgi_temp_path       /tmp/uwsgi_temp;
+    scgi_temp_path        /tmp/scgi_temp;
+
+}