Add basic docker support for development

Assuming docker engine is installed, it is now possible to run the dev
server using 'docker-compose up --build' or run the production version using
'docker build -t bitburner . && docker run -it -p 8000:80 bitburner'.

Dockerfile

@@ -0,0 +1,35 @@
+FROM node:15.14.0 AS base
+
+WORKDIR /app
+
+# Scripts used in the npm preinstall hook
+COPY scripts/engines-check.js scripts/semver.js scripts/
+
+# Adding our dependencies and install before adding the rest of the files
+# This prevents reinstallation of npm packages for every subsequent code modification
+ENV npm_config_update_notifier=false
+COPY package.json package-lock.json ./
+RUN npm ci --loglevel=error --no-audit --no-fund && npm rebuild node-sass
+
+# Adding all the remaining source files
+COPY . .
+
+# We need more than the default 512MB otherwise webpack will throw 'heap out of memory' exceptions
+# https://nodejs.org/api/cli.html#cli_max_old_space_size_size_in_megabytes
+ENV NODE_OPTIONS=--max-old-space-size=1536
+
+FROM base AS dev
+# This is the main development build using the file watcher if you mount volumes
+USER node
+EXPOSE 8000
+CMD npm run start:container
+
+FROM base AS prod-dist
+# We'll simply build the production dist files here to later reuse in a simple webserver
+RUN npm run build
+
+FROM nginx:1.20.0-alpine AS prod
+WORKDIR /usr/share/nginx/html
+COPY --from=prod-dist /app/dist ./dist
+COPY --from=prod-dist /app/index.html /app/favicon.ico /app/license.txt ./
+EXPOSE 80