Adds Dockerfile to build a container image which hosts diceware

The container is built in two steps (docker builder pattern):

1. Node/npm build stage
2. Final image with Nginx and static files to serve

Build the mage with this command:

    docker image build -t dceware .

Run a container with this command:

    docker run --rm -p 8080:80  dceware

Then you can visit your local diceware at:

http://localhost:8080/

Signed-off-by: Sven Strittmatter <ich@weltraumschaf.de>

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:20-bullseye-slim as builder
+
+RUN mkdir /tmp/diceware
+COPY . /tmp/diceware/
+WORKDIR /tmp/diceware
+
+RUN npm run build
+
+FROM nginx:1.25-bullseye
+
+COPY --from=builder /tmp/diceware/assets /usr/share/nginx/html/assets/
+COPY --from=builder /tmp/diceware/dist /usr/share/nginx/html/dist/
+COPY --from=builder /tmp/diceware/fonts /usr/share/nginx/html/fonts
+COPY --from=builder /tmp/diceware/favicon.ico /usr/share/nginx/html/favicon.ico
+COPY --from=builder /tmp/diceware/index.html /usr/share/nginx/html/index.html
+COPY --from=builder /tmp/diceware/robots.txt /usr/share/nginx/html/robots.txt
+
+RUN chmod -R a+rX /usr/share/nginx/html