Add Python back into our Docker image

[joehan]

Description

Fixes #9855 , and reorders the command to avoid layers with outdated deps.

[gemini-code-assist]

Summary of Changes

Hello @joehan, 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 reintroduces Python into the Docker image, specifically to enable support for Cloud Functions, and refines the Dockerfile's package management process. The changes address a reported issue by optimizing the order of apk commands and centralizing cache cleanup, which collectively enhances the efficiency of Docker image layer management and build times.

Highlights

• Python Reintroduction: Python (specifically python3 and py3-pip) has been added back into the Docker image, primarily to support Cloud Functions.
• Dockerfile Optimization: The apk commands in the Dockerfile have been reordered to first update, then add packages, then upgrade, and finally clean the cache, which helps in creating more efficient Docker layers.
• Cache Cleanup Consolidation: The rm -rf /var/cache/apk/* command for cleaning the apk cache has been moved and consolidated into the main package installation step, removing it from the emulator setup command.

🧠 New Feature in Public Preview: You can now enable Memory to help Gemini Code Assist learn from your team's feedback. This makes future code reviews more consistent and personalized to your project's style. Click here to enable Memory in your admin console.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request adds Python back to the Docker image and refactors the package installation commands. The changes are generally good, but I've suggested a small improvement to the Dockerfile RUN command to make it more efficient and idiomatic.