build: dockerized lustpress and add .dockerignore

.dockerignore

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+node_modules
+npm-debug.log

Dockerfile

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+FROM node:latest
+
+WORKDIR /srv/app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+EXPOSE 3000
+CMD ["node", "build/src/index.js"]