Add missing nl (#212)

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**Description**

Changes proposed in this pull request:

- ...
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- ...

**Related issue(s)**
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example, `Resolves #123`, `Fixes #43`, or `See also #33`. -->

.github/workflows/compass-manager.yaml

@@ -180,8 +180,8 @@ jobs:
             # if build-image was successful
             if [ "${{ needs.build-image.result }}" == "success" ]; then
               echo '## Image'
-              echo '```json'
+              printf '\n```json\n'
               echo '${{ needs.build-image.outputs.images }}' | jq
-              echo '```'
+              printf '\n```\n'
             fi
           } >> $GITHUB_STEP_SUMMARY