releng: Build with tracecompass-e4.38 target by default

[PatrickTasse]

What it does

releng: Build with tracecompass-e4.38 target by default

How to test

Build in stable branch with default target.

Follow-ups

N/A

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the instructions in this template

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[bhufmann]

Looks good to me. Thanks!