ci: add rust-toolchain.toml reproducible builds

[KooshaPari]

User description

Adds MSRV policy BytePort.

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Note

Low Risk
Low risk change that only affects developer/CI toolchain selection; main risk is unexpected breakage if the code depends on a different Rust version or missing components in some environments.

Overview
Pins Rust builds by adding rust-toolchain.toml that selects the stable channel and ensures rustfmt, clippy, and rust-src are installed for consistent CI and local development tooling.

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CodeAnt-AI Description

Pin the Rust toolchain for consistent builds and local tooling

What Changed

• Rust builds now use the stable toolchain by default
• Common developer tools for formatting, linting, and Rust source support are installed automatically
• Local development and CI are more likely to use the same Rust version and tooling

Impact

✅ More consistent Rust builds
✅ Fewer formatting and linting setup issues
✅ Smoother local development setup

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Details

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gemini-code-assist]

Code Review

This pull request introduces a rust-toolchain.toml file to define the project's Rust environment. Feedback suggests pinning the toolchain to a specific version (1.77.2) rather than using the "stable" channel to ensure build reproducibility and alignment with the project's minimum supported Rust version.

[gemini-code-assist]

The PR title mentions 'reproducible builds', but using channel = "stable" means the toolchain will automatically update whenever a new stable version of Rust is released. To ensure true reproducibility and align with the MSRV defined in frontend/web/src-tauri/Cargo.toml (which is 1.77.2), you should pin a specific version here.

Suggested change

	channel = "stable"
	channel = "1.77.2"

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 79ff771. Configure here.}

[cursor]

Toolchain channel "stable" breaks version detection regex

Medium Severity

Setting channel = "stable" in rust-toolchain.toml breaks the Rust runtime version detection in backend/nvms/lib/awsutil.go, which uses the regex channel = ["'](\d+\.\d+)["'] to extract a numeric version from this file. The string "stable" won't match, so the buildpack will fail to detect the Rust version. Additionally, "stable" doesn't define an MSRV or provide reproducible builds as the PR intends — it floats to whatever the latest stable release is.

Additional Locations (1)

• rust-toolchain.toml#L1-L3

 

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[kilo-code-bot]

Code Review Summary

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
WARNING	2

Issue Details (click to expand)

WARNING

File	Line	Issue
rust-toolchain.toml	2	Using channel = "stable" breaks reproducibility - should pin to specific version (e.g., 1.77.2) to match MSRV defined in frontend/web/src-tauri/Cargo.toml
rust-toolchain.toml	2	The value "stable" breaks the Rust version detection regex in backend/nvms/lib/awsutil.go (line 226) expecting a numeric version pattern

Files Reviewed (1 file)

• rust-toolchain.toml - 2 issues

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