fix: quote architecture in OCM extraIdentity to prevent int coercion

[ccwienk]

Summary

• GHA expands ${{ matrix.args.arch }} into the inline YAML block without quotes, so 386 is parsed as a YAML integer rather than a string
• extraIdentity values must be strings per the OCM spec (dict[str, str]), causing dacite.WrongTypeError when the component descriptor is deserialised downstream (e.g. in the release-notes action)
• Fix: wrap the expression in single quotes so YAML treats it as a string literal

Test plan

• Trigger a build for the windows/386 target and verify the release pipeline completes without WrongTypeError

[Kostov6]

/lgtm
/approve

[gardener-prow]

LGTM label has been added.

Details

Git tree hash: 22d24b2ab2ec979eafe7692a510df3294a754d27

[gardener-prow]

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