RFR: Better formatting of GitLab MR checks

[Erik Helin]

Hi all,

please this review this small PR that enhances the formatting of GitLab merge request check runs.

Thanks,
Erik

## Testing
- `sh gradlew test` passes
- `sh gradlew images` passes

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Commits:
 - 6a0cb3d9: Better formatting of GitLab MR checks

Changes: https://git.openjdk.java.net/skara/pull/210/files
 Webrev: https://webrevs.openjdk.java.net/skara/210/webrev.00
  Stats: 25 lines in 1 file changed: 4 ins; 0 del; 21 mod
  Patch: https://git.openjdk.java.net/skara/pull/210.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/210/head:pull/210

PR: https://git.openjdk.java.net/skara/pull/210