title: How to copy multiple files in one layer using a Dockerfile?
body: <p>The following <code>Dockerfile</code> contains four <code>COPY</code> layers:</p>
  
  <pre><code>COPY README.md ./
  COPY package.json ./
  COPY gulpfile.js ./
  COPY __BUILD_NUMBER ./
  </code></pre>
  
  <p>How to copy these files using one layer instead? The following was tried:</p>
  
  <pre><code>COPY [
      "__BUILD_NUMBER ./",
      "README.md ./",
      "gulpfile ./",
      "another_file ./",
  ]
  </code></pre>