Add working docker

.dockerignore

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+*
+!src/*
+!build/*
+!package.json
+!package-lock.json
+!main.js

Dockerfile

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+FROM node:carbon
+WORKDIR /srv/www
+
+# make node_modules cached.
+# Src: https://nodesource.com/blog/8-protips-to-start-killing-it-when-dockerizing-node-js/
+#
+COPY package.json package-lock.json ./
+
+# When running with --production --pure-lockfile,
+# There will always be some missing modules. Dunno why...
+#
+RUN npm install --production
+
+# Other files, so that other files do not interfere with node_modules cache
+#
+COPY . .
+
+EXPOSE 5001
+
+ENTRYPOINT NODE_ENV=production node build/index