ci: Add rust build cache and update actions in Tauri release workflow

[SameDesu123]

PR Checklist

• Required Checks
  • Have you added type definitions?
  • Have you tested your changes?
  • Have you checked that it won't break any existing features?
• If your PR uses models¹, check the following:
  • Have you checked if it works normally in all models?
  • Have you checked if it works normally in all web, local, and node-hosted versions? If it doesn't, have you blocked it in those versions?
• If your PR is highly AI generated², check the following:
  • Have you understood what the code does?
  • Have you cleaned up any unnecessary or redundant code?
  • Is it not a huge change?
    • We currently do not accept highly AI generated PRs that are large changes.

Summary

Optimizes the Tauri release workflow by adding Rust build caching, simplifying pnpm caching, removing redundant macOS target installation, updating GitHub Action versions.

Related Issues

None.

Changes

• Adds matrix target values and installs only the required Rust target for each Tauri job.
• Replaces the manual pnpm store cache step with the built-in actions/setup-node pnpm cache.
• Adds Swatinem/rust-cache@v2 for src-tauri Cargo artifacts.
• Removes duplicate macOS rustup target add steps.
• Switches CI dependency installation to pnpm install --frozen-lockfile.
• Updates workflow actions where newer major versions are available.

Impact

This should reduce repeated Tauri release build work in GitHub Actions while keeping release artifact generation unchanged, including updater artifacts. The committed Cargo lockfile also prevents CI from resolving different Rust dependency versions on each run.

For context, I compared the existing upstream workflow usage run:
https://github.com/kwaroran/Risuai/actions/runs/24605548471/usage

Job	Run time
publish-tauri (macos-latest, --target x86_64-apple-darwin)	8m 24s
publish-tauri (macos-latest, --target aarch64-apple-darwin)	6m 28s
publish-tauri (ubuntu-latest, --target x86_64-unknown-linux-gnu)	13m 0s
publish-tauri (windows-latest, --target x86_64-pc-windows-msvc)	13m 37s
Total	41m 29s

---

with the fork test run using the optimized workflow:
https://github.com/SameDesu123/Risuai/actions/runs/25267682504/usage

Job	Run time
publish-tauri (macos-latest, aarch64-apple-darwin, --target aarch64-apple-darwin --config src-tau...	4m 51s
publish-tauri (macos-latest, x86_64-apple-darwin, --target x86_64-apple-darwin --config src-tauri...	3m 25s
publish-tauri (ubuntu-latest, x86_64-unknown-linux-gnu, --target x86_64-unknown-linux-gnu --confi...	8m 36s
publish-tauri (windows-latest, x86_64-pc-windows-msvc, --target x86_64-pc-windows-msvc --config s...	6m 37s
Total	23m 29s

The fork test run showed the streamlined step layout with Rust cache and without the old manual pnpm cache / duplicate macOS target installation steps.

Additional Notes

Validated locally with:

• ruby -e "require 'yaml'; Dir['.github/workflows/*.{yml,yaml}'].each { |f| YAML.load_file(f) }"
• git diff --check

Footnotes

1. Modifies the behavior of prompting, requesting, or handling responses from AI models. ↩

2. Over 80% of the code is AI generated. ↩

[SameDesu123]

cargo.lock changes are reverted.

[SameDesu123]

#1440
Hang up until the npm version is fixed.