Add Dockerfile

.dockerignore

+.git
+.gitignore
+.dockerignore
+Dockerfile
+node_modules
+*.md
+*.txt
+*.example
+.editorconfig
+yarn.lock

Dockerfile

+FROM node:alpine
+LABEL maintainer="markus.opolka@fau.de"
+
+COPY . /app
+WORKDIR /app
+
+RUN yarn install
+RUN yarn run build
+
+EXPOSE 3000
+
+ENTRYPOINT node app.js