feat: add official docker img with better caching

[ahmed-mekky]

fixes #829

[Copilot]

Pull request overview

This PR adds official Docker image support with improved build caching using cargo-chef, addressing issue #829. The implementation uses a multi-stage build process that separates dependency compilation from the final application build, enabling better layer caching and faster rebuilds.

Key Changes:

• Refactored Dockerfile to use cargo-chef for dependency caching with a three-stage build (planner, builder, runtime)
• Added GitHub Actions workflow job to build and publish multi-platform Docker images (amd64/arm64) to GitHub Container Registry
• Configured automated Docker image tagging with semantic versioning

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Dockerfile	Restructured to use cargo-chef with multi-stage build pattern for improved caching; builds release binary with rustls feature and strips it before copying to minimal runtime image
.github/workflows/release.yml	Added docker job that builds and pushes multi-platform images to ghcr.io with GitHub Actions cache support and semantic version tagging

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[hatoo]

Thank you!