Added Dockerfile.

.dockerignore

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+# Ignore everything by default
+*
+
+# Allow the public project files.
+!src
+!public
+!Dockerfile
+!package*.json
+!README.md
+!nginx.conf

Dockerfile

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+FROM node:16.6.1-alpine AS builder
+
+WORKDIR /tmp
+COPY package*.json ./
+
+RUN npm ci --only=prod
+COPY . .
+
+ENV NODE_ENV=production
+RUN npm run build
+
+FROM nginx:alpine
+
+COPY --from=builder /tmp/build /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+RUN touch /var/run/nginx.pid
+RUN chown -R nginx:nginx /var/run/nginx.pid /usr/share/nginx/html /var/cache/nginx /var/log/nginx /etc/nginx/conf.d
+USER nginx
+
+EXPOSE 8080
+
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

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+server_tokens off;
+server {
+    listen       8080;
+    server_name  localhost;
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+        try_files $uri /index.html;
+    }
+}