title: How to escape a colon in .gitlab-ci.yml?
body: <p>I have a line like this:</p>
  <pre class="lang-yaml prettyprint-override"><code>sed -i 's/&quot;host: TND_HOST&quot;/&quot;host: process.env.TND_HOST&quot;/g' services/management/tnd.js
  </code></pre>
  <p>and the option above causes linting error:</p>
  <pre><code>This GitLab CI configuration is invalid: (&lt;unknown&gt;): mapping values are not allowed in this context at line [...]
  </code></pre>
  <p>Other options that do not work are:</p>
  <pre class="lang-yaml prettyprint-override"><code>sed -i 's/host: TND_HOST/host: process.env.TND_HOST/g' services/management/tnd.js
  
  sed -i &quot;s/host: TND_HOST/host: process.env.TND_HOST/g&quot; services/management/tnd.js
  </code></pre>
  <p>Any way to overcome the issue and keep it as a one-liner?</p>