How can I pass a multi-line variable to a docker container?
<p>According to <a href="https://github.com/docker/docker/issues/12997#issuecomment-204580515" rel="noreferrer">this comment,</a> multi-line variables are supported with <code>docker compose</code>:</p>

<pre><code>environment:
  KEY: |-
    line1
    line2
</code></pre>

<p>However, when I execute <code>echo $KEY</code> in the container, it has replaced the newline with spaces:</p>

<p><code>line1 line2</code></p>

<p>Am I missing something? My docker version is 1.12.1.</p>