Create dockerfile

dockerfile

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+# syntax=docker/dockerfile:1
+
+# Stage 1: Base image.
+## Start with a base image containing NodeJS so we can build Docusaurus.
+FROM node:lts as base
+## Disable colour output from yarn to make logs easier to read.
+ENV FORCE_COLOR=0
+## Enable corepack.
+RUN corepack enable
+## Set the working directory to `/opt/docusaurus`.
+WORKDIR /opt/docusaurus
+
+# Stage 2b: Production build mode.
+FROM base as prod
+## Set the working directory to `/opt/docusaurus`.
+WORKDIR /opt/docusaurus
+## Copy over the source code.
+COPY . /opt/docusaurus/
+## Install dependencies with `--immutable` to ensure reproducibility.
+RUN npm ci
+## Build the static site.
+RUN npm run build
+
+# Stage 3a: Serve with `docusaurus serve`.
+FROM prod as serve
+## Expose the port that Docusaurus will run on.
+EXPOSE 3000
+## Run the production server.
+CMD ["npm", "run", "serve", "--", "--host", "0.0.0.0", "--no-open"]