Agent Evals: Copy Firebase CLI configs in dev mode

[samedson]

Description

We don't yet have a setup where it can login automatically. For dev mode, we're going to rely on your current login.

[gemini-code-assist]

Summary of Changes

Hello @samedson, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the developer experience for agent evaluations by implementing a mechanism to automatically copy Firebase CLI configuration files during development testing. This change ensures that the agent evaluation tests can utilize the developer's existing authentication credentials, thereby simplifying the setup and execution of tests in a development environment and removing the need for a separate login process.

Highlights

• Firebase CLI Config Copying: Introduced functionality to copy Firebase CLI configuration files (firebase-tools.json) from the user's home directory to the test environment.
• Dev Mode Integration: Enabled this configuration copying specifically for the test:dev script by setting the COPY_FIREBASE_CLI_CONFIG environment variable, allowing agent evaluations to utilize the developer's existing Firebase CLI authentication.
• Improved Developer Workflow: Streamlines the development process for agent evaluations by removing the need for manual authentication setup within the test environment, leveraging existing user credentials.

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[gemini-code-assist]

Code Review

This pull request adds a development mode feature to copy local Firebase CLI configuration, allowing tests to use the developer's existing authentication. The changes are mostly in scripts/agent-evals/src/runner/index.ts. My review focuses on improving the robustness of this new functionality. Specifically, I've suggested using a more reliable method to determine the user's home directory and adding error handling to prevent crashes if the configuration file doesn't exist. These changes will make the new feature more stable across different developer environments.

[joehan]

Seems reasonable to me