[Misc] Add Dockerfile for XET Rust binding linux build

[beiguo218]

What type of PR is this?

/kind feature
/kind build

What this PR does / why we need it:

1. Added a Dockerfile under pkg/xet/build/ to enable Linux build of the XET Rust binding library.
2. Updated Makefile

Does this PR introduce a user-facing change?

No

[gemini-code-assist]

Summary of Changes

Hello @beiguo218, 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 enhances the build infrastructure for the XET Rust binding library by introducing Docker-based Linux build capabilities. It provides a standardized and isolated environment for compiling the library on Linux, integrating these new build targets into the existing Makefile. This change ensures that release artifacts can be consistently generated across multiple operating systems and architectures, improving the library's portability and ease of distribution.

Highlights

• Dockerfile for Linux Builds: A new Dockerfile has been added under pkg/xet/build/ to facilitate the building of the XET Rust binding library specifically for Linux environments, ensuring a consistent and reproducible build process.
• Makefile Integration: The Makefile has been updated to include new release-linux-% targets, allowing for Docker-based Linux builds (amd64 and arm64) to be triggered directly from the make command. The main release target now orchestrates builds for both Darwin and Linux platforms.
• Multi-platform Release Support: The overall make release command has been enhanced to build release artifacts for all supported platforms (Darwin aarch64, Darwin x86_64, Linux amd64, and Linux arm64), streamlining the release process for the XET Rust binding library.

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[gemini-code-assist]

Code Review

This pull request adds a Dockerfile and Makefile targets to enable building the Rust bindings for Linux. The changes look good overall. I've added a few suggestions to improve the Dockerfile for better caching and a smaller image size, and to clean up an unused argument in the Makefile. These are best practices for writing Dockerfiles and will improve build efficiency.