test: add layout for raid1 test

[HuijingHei]

See coreos/coreos-assembler#4525

[openshift-ci]

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[gemini-code-assist]

Code Review

This pull request updates the RAID1 test configuration in tests/kola/raid1/config.bu to include a layout field with a {{LAYOUT}} placeholder. The review feedback correctly identifies that the placeholder should be enclosed in double quotes to prevent YAML parsing errors, as values starting with curly braces are interpreted as flow mappings.

[gemini-code-assist]

The placeholder {{LAYOUT}} should be enclosed in double quotes. In YAML, a value starting with { is interpreted as the start of a flow mapping. Quoting the placeholder ensures the file remains valid YAML and is correctly treated as a string by linters and editors. Additionally, consider making the comment more descriptive of the placeholder's purpose rather than just providing a link to a pull request.

  # The {{LAYOUT}} placeholder is replaced by the platform-specific layout (e.g. BIOS, EFI)
  layout: "{{LAYOUT}}"