[dokcer] build into docker image.

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

bin/docker.build

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+#!/bin/bash
+
+echo "Generating source code tarbal"
+git archive --format=tar HEAD | gzip > docker/src.tar.gz
+
+echo "Building docker image"
+docker build -t leetcode-cli docker/

docker/Dockerfile

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+FROM node:alpine
+LABEL maintainer="skygragon@gmail.com"
+
+COPY src.tar.gz /
+RUN mkdir -p /tmp/leetcode-cli && \
+    cd /tmp/leetcode-cli && \
+    tar zxf /src.tar.gz && \
+    npm install && \
+    tar zcf /leetcode-cli.tar.gz . && \
+    rm -rf /tmp/leetcode-cli /src.tar.gz
+
+VOLUME ["/root"]
+WORKDIR /root
+COPY entrypoint /
+ENTRYPOINT ["/entrypoint"]

docker/entrypoint

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+#!/bin/sh
+
+srcdir=/root/leetcode-cli
+leetcode=$srcdir/bin/leetcode
+
+if [ ! -f "$leetcode" ]; then
+  echo "Not found leetcode, install now ..."
+  mkdir -p $srcdir
+  tar zxf /leetcode-cli.tar.gz -C $srcdir
+fi
+
+export TERM=xterm-256color
+exec $leetcode $@