chore: use synthtool with no-install nox format

[ohmayr]

use synthtool with no-install nox format

[gemini-code-assist]

Summary of Changes

Hello @ohmayr, 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 performs a maintenance update by changing the specific Git commit hash for the synthtool repository cloned within the .generator/Dockerfile. This ensures that the build environment utilizes a more recent version of synthtool, which may incorporate changes related to a "no-install nox format" as suggested by the PR title and description.

Highlights

• Dependency Update: The synthtool dependency within the .generator/Dockerfile has been updated to a newer Git commit (afd7725f32d522a95e964884e0fba6d0d6b4cb6a).

Changelog

• .generator/Dockerfile
  • Updated the git checkout SHA for the synthtool repository.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates the pinned commit for synthtool in the generator's Dockerfile. My review includes a suggestion to improve the efficiency of fetching this dependency by using a source archive instead of a full git clone, which will result in smaller and faster Docker builds.

[gemini-code-assist]

For better efficiency and smaller Docker image layers, consider downloading a source archive of the specific commit instead of cloning the entire repository history. git clone can be slow and consume significant disk space, especially for repositories with a long history. Using curl to download a .tar.gz archive is much faster and results in a smaller layer.

RUN curl -L https://github.com/googleapis/synthtool/archive/afd7725f32d522a95e964884e0fba6d0d6b4cb6a.tar.gz | tar -xz && \
    mv synthtool-afd7725f32d522a95e964884e0fba6d0d6b4cb6a synthtool