docs: Add a section in the Rust guide to use DHI

[edithturn]

Description

Updated the Rust language guide to include Docker Hardened Images (DHI).

Changes include:

• Added DHI as an option with tab-based layout (Official image / Hardened image)
• Added a DHI-based Dockerfile example
• Updated build instructions to match docker init behavior
• Added DHI quickstart link in "Related information"

This follows the same structure used in the Bun and Ruby DHI updates.

Reviews

• Technical review
• Editorial review
• Product review

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[igor-alexandrov]

@edithturn I mirrored Rust images to my account, and the actual language version is 1.91.1. Maybe the guide should be updated to it?

[edithturn]

@edithturn I mirrored Rust images to my account, and the actual language version is 1.91.1. Maybe the guide should be updated to it?

Hi @igor-alexandrov , thank you for the review and for pointing this out! 🙌
I’ve updated the Rust version to the latest one as suggested.

While testing, I also noticed that one of the dependencies in the Hello World base example (used by this part of the docs) didn’t compile with Rust 1.91.1 (but worked with 1.70.0), so I opened a PR to update the Cargo.toml and fix the build there as well:
👉 https://github.com/docker/docker-rust-hello/pull/1

Thanks again for the feedback, I really appreciate it!