ci: simplify release builds

[sou1118]

Summary

• build Linux ARM64 releases on the native ubuntu-24.04-arm runner
• remove the RISC-V release target and the cross dependency
• use cargo build --release --target consistently for every release target

Validation

• actionlint
• oxfmt --check .
• zizmor .github/workflows/
• git diff --check

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📥 Commits

Reviewing files that changed from the base of the PR and between e575d9f and 8752214.

📒 Files selected for processing (1)

• .github/workflows/release.yml

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[Copilot]

Pull request overview

This PR simplifies the release workflow by removing the cross-based build path and the RISC-V target, and by standardizing on cargo build --release --target for all release artifacts. It also moves Linux ARM64 builds onto a native ARM GitHub-hosted runner to avoid cross-compilation complexity.

Changes:

• Switch Linux ARM64 builds to run on ubuntu-24.04-arm instead of using cross on ubuntu-latest.
• Remove the RISC-V release target and all cross installation/build steps.
• Always add the Rust target with rustup target add and build with cargo build --release --target.

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