test: add tests for initCommand

[devin-ai-integration]

Add test coverage for the initCommand functionality, focusing on PostgreSQL flow and GitHub Actions workflow generation.

Link to Devin run: https://app.devin.ai/sessions/1fe2b26b754346d898a277130a483f94
Requested by: tsuyoshi.hoshino@route06.co.jp

[devin-ai-integration]

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