chore(librarian): temporarily add gdb for remote debugging

[parthea]

Towards #14992

[gemini-code-assist]

Summary of Changes

Hello @parthea, 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 introduces a temporary modification to the generator's Dockerfile by including the gdb debugger. This addition is intended to facilitate remote debugging efforts for a specific, ongoing issue, and is explicitly marked for removal once the underlying problem is resolved.

Highlights

• Temporary GDB Addition: The gdb package has been temporarily added to the .generator/Dockerfile to assist with remote debugging.
• Issue Resolution: This change is specifically aimed at addressing and debugging an issue tracked in https://github.com/googleapis/google-cloud-python/issues/14992.

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[gemini-code-assist]

Code Review

This pull request adds the gdb debugger to the generator's Docker image to facilitate remote debugging of an issue. The change is clearly marked as temporary with a corresponding TODO and issue link. My review includes a suggestion to consider a multi-stage Docker build for such scenarios in the future. This would keep the primary image lean and secure by isolating debugging tools into a separate, on-demand build stage. While the current approach is acceptable for a short-term fix, adopting a multi-stage pattern is a recommended practice for better image management.

[gemini-code-assist]

While adding gdb is understandable for temporary debugging, committing it to the main Dockerfile increases the image size and potential attack surface. A better practice is to use a multi-stage build to isolate debugging tools.

You could define a separate debug stage that builds upon the main image and only adds gdb. This keeps the default image lean and secure, while allowing a debug-enabled version to be built on demand (e.g., docker build --target debug ...).

Example of a debug stage:

FROM builder as debug
RUN apt-get update && apt-get install -y --no-install-recommends gdb && rm -rf /var/lib/apt/lists/*

Since this is a temporary change with a TODO, it's acceptable. However, please consider this pattern for future needs to maintain a clean base image.

[parthea]

python-librarian-generator-presubmit (cloud-sdk-python-ci) passed. The other presubmit checks are not applicable. They are currently stuck due to an outage with GHA.