title: Error response from daemon: failed to parse Dockerfile: file with no instructions
body: <p>Below is my docker file. </p>
  
  <pre><code>FROM node:6-alpine
  EXPOSE 3000
  RUN apk add -update tini
  RUN mkdir -p /usr/src/app
  WORKDIR /usr/src/app
  COPY package.json package.json
  RUN npm install &amp;&amp; npm cache clean
  COPY . .
  CMD [ "tini","--","node","./bin/www" ]
  </code></pre>
  
  <p>I am running this on Windows using a command</p>
  
  <pre><code>docker build -t testnode .
  </code></pre>
  
  <p>getting below error</p>
  
  <pre><code>Sending build context to Docker daemon  443.4kB
  Error response from daemon: failed to parse Dockerfile: file with no instructions.
  </code></pre>
  
  <p>There are no extra space in my file and Encoding is ANSI.</p>