Add Dockerfile for building on Linux.

Author: cknitt

docker/Dockerfile

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+FROM ubuntu:18.04
+
+RUN apt-get update \
+  && DEBIAN_FRONTEND=noninteractive apt-get install -y nodejs npm git rsync m4 curl \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN npm i -g esy@0.2.11

docker/README.md

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+Docker image for running esy and building bs-react-intl-extractor on Linux.