Cache Rust build artifacts in CI

[wksantiago]

Summary by CodeRabbit

• Chores
  • Optimized build pipeline caching strategy to improve build performance and reduce redundant compilation steps.

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Note: This release contains infrastructure improvements with no user-facing changes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: dadce979-198b-4ae5-b813-574572588a19

📥 Commits

Reviewing files that changed from the base of the PR and between 1f08344 and 7640bf4.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/release.yml

Walkthrough

CI workflows (ci.yml and release.yml) are updated to cache Rust build outputs (compiled jniLibs and uniffi bindings) to avoid rebuilding when dependencies haven't changed. A new cache step with conditional skip logic is added, and the Swatinem/rust-cache configuration is narrowed from keep/keep-mobile to keep in ci.yml.

Changes

Cohort / File(s)	Summary
CI workflow caching updates .github/workflows/ci.yml	Modified Swatinem/rust-cache to cache only keep instead of keep/keep-mobile. Added actions/cache step to cache app/src/main/jniLibs and uniffi bindings with a composite key including OS, architecture, Rust/cargo-ndk versions, and file hashes. Conditionally skip Install cargo-ndk and Build native libraries steps when cache hits.
Release workflow caching additions .github/workflows/release.yml	Added Swatinem/rust-cache step for cargo registry with cache-targets: "false". Added actions/cache step for native build outputs (app/src/main/jniLibs and uniffi bindings) keyed by OS, NDK/Rust versions, input hashes, and commit SHA. Made cargo-ndk installation and ./build-rust.sh execution conditional on cache misses.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related issues

• Cache Rust build artifacts in CI #222: Directly addresses the same CI workflow caching enhancements—both expand rust caching, add actions/cache for jniLibs and uniffi outputs, and implement conditional build step skipping.

Possibly related PRs

• Wire build-rust.sh into Gradle preBuild #221: Related through shared build outputs—manages Gradle task outputs and up-to-date inputs for the same jniLibs and uniffi bindings that this PR caches in CI.
• Enforce exact toolchain versions #231: Related through overlapping workflow steps—pins and adds preflight checks to the same cargo-ndk installation and native library build steps that this PR conditionally skips on cache hits.
• Add bit-for-bit APK reproducibility #233: Related through release workflow modifications—cache key explicitly includes build-rust.sh and scripts/\\/\*.sh, which are modified in that PR.

Poem

🐰 Caching spells, we rabbits weave,
Build outputs now on disk stay,
No more rebuilds we receive,
Swift CI pipelines save the day! 🚀

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Cache Rust build artifacts in CI' directly and clearly summarizes the main changes—adding caching for Rust build outputs in both ci.yml and release.yml workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch Cache-Rust

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[wksantiago]

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[wksantiago]

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[kwsantiago]

ACK 1f08344