ci: add .gitleaksignore

Summary

• ci: add .gitleaksignore

На основе сканирования gitleaks: https://git.picodata.io/picodata/devops/secrets-report/-/jobs/338379/artifacts/browse/reports/ Исключаем конкретный коммит из проверки.

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• Close #...
• Cherry-pick to: none / 24.6
• Docs follow-up: not necessary / new issue
• Changelog is updated

requested review from @d.rodionov

assigned to @v.shunkov

approved this merge request

merged