Two devenv patches

[cgwalters]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @cgwalters, 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 significantly refactors the development environment setup for both c10s and Debian-based container images. By extracting the installation logic for various tools (like goose, bcvk, and scorecard) and Rust into separate, reusable shell scripts, the Containerfiles become much cleaner and easier to maintain. A key addition is the integration of the Kani formal verification tool, providing enhanced capabilities for static analysis of Rust code within the development environment.

Highlights

• Refactored Containerfile Logic: Consolidated complex tool and Rust installation steps from devenv/Containerfile.c10s and devenv/Containerfile.debian into dedicated, reusable shell scripts (fetch-tools.sh, install-rust.sh, install-kani.sh).
• Kani Formal Verification Integration: Integrated the Kani formal verification tool into the development environment, providing advanced static analysis capabilities for Rust projects.
• Improved Dockerignore: Updated the .dockerignore file to properly exclude the newly introduced installation scripts, ensuring cleaner and more efficient Docker builds.

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[gemini-code-assist]

Code Review

This pull request refactors the devenv Containerfiles by extracting shell script logic into separate, reusable files, which improves maintainability and readability. It also adds support for the Kani formal verification tool. My review includes a few suggestions to improve robustness and consistency, such as fixing a potential bug in fetch-tools.sh and aligning package manager cache cleaning practices across Docker stages.

[gursewak1997]

lgtm