Add GITHUB_TOKEN in docker buildx build command for custom flavor

[davidfevre-gouv-nc]

Fixes #6544

Proposed Changes

This pull request introduces a minor update to the Docker build process by adding support for passing a secret to the build command.

• Docker build customization:
  • In the build_custom_flavor function in .automation/build.py, the --secret id=GITHUB_TOKEN flag is now included in the Docker build command to allow secure access to GitHub tokens during image creation.

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

---

Note

Use docker buildx and pass GITHUB_TOKEN as a secret when building custom flavor images; update changelog.

• Automation:
  • Update build_custom_flavor in .automation/build.py to use docker buildx build and pass --secret id=GITHUB_TOKEN during custom flavor image build.
• Changelog:
  • Add entry linking [Custom Flavor builds fail due to missing GITHUB_TOKEN #6544] in CHANGELOG.md.

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