title: Gitlab-ci image with docker and java/gradle
body: <p>I'm including an integration test into my application using library &quot;https://www.testcontainers.org/&quot;.</p>
  <p>This library need a docker environment to run &quot;gradlew test&quot; command.</p>
  <p>How would you use a docker image (which include docker and Gradle) in a <code>gitlab-ci.yml</code>?</p>