ci: implement Rust caching & remote Turbo caching

[goosewobbler]

Closes #62

[greptile-apps]

Greptile Overview

Greptile Summary

This PR implements GitHub-native Turbo caching across all CI workflows by integrating the rharkor/caching-for-turbo@v1 action. The implementation adds caching steps before build/test execution in four reusable workflow files, which should significantly improve CI performance by caching Turbo task outputs.

Key Changes

• Added rharkor/caching-for-turbo@v1 action to build, E2E, package, and unit test workflows
• Positioned caching step after environment setup but before build/test execution
• Added "Cache Report" step to display HIT/MISS status for visibility

Issues Found

• Indentation errors: Multiple workflow files have inconsistent indentation introduced by this PR, with extra leading spaces in YAML blocks that could cause parsing issues or inconsistent formatting
• Missing Rust caching: The PR title mentions "Rust caching" but no Rust-specific caching configuration was added. The Tauri build workflows (e.g., _ci-build-tauri-apps.reusable.yml) that compile Rust code do not include any Rust caching mechanisms like Swatinem/rust-cache

Note on PR Title

The PR title claims to implement both "GitHub-native Turbo caching + Rust caching" but only Turbo caching is implemented. Consider either adding Rust caching to Tauri build workflows or updating the PR title to accurately reflect the changes.

Confidence Score: 3/5

• This PR is safe to merge but requires formatting fixes and doesn't fully implement the stated scope
• The Turbo caching implementation is sound and correctly positioned in the workflow, but the PR has syntax issues (indentation errors) that need fixing before merge. Additionally, the PR title mentions Rust caching which is not implemented, creating a mismatch between the title and actual changes.
• All three test workflow files (_ci-e2e, _ci-package, _ci-unit) need indentation fixes

Important Files Changed

Filename	Overview
.github/workflows/_ci-build.reusable.yml	Added GitHub-native Turbo caching action before build step with cache reporting
.github/workflows/_ci-e2e.reusable.yml	Added Turbo caching action but introduced indentation errors in multiple steps
.github/workflows/_ci-package.reusable.yml	Added Turbo caching and cache reporting but introduced indentation errors in validation script
.github/workflows/_ci-unit.reusable.yml	Added Turbo caching and cache reporting but introduced indentation errors in validation script

Sequence Diagram

sequenceDiagram
    participant GHA as GitHub Actions
    participant Setup as Setup Environment
    participant TurboCache as Turbo Cache Action
    participant Turbo as Turbo Build/Test
    participant Artifacts as Build Artifacts

    Note over GHA,Artifacts: CI Build Workflow
    GHA->>Setup: Checkout & Setup Node/PNPM
    Setup-->>GHA: Environment Ready
    GHA->>TurboCache: rharkor/caching-for-turbo@v1
    TurboCache->>TurboCache: Check GitHub cache for task outputs
    alt Cache Hit
        TurboCache-->>Turbo: Restore cached outputs
    else Cache Miss
        TurboCache-->>Turbo: No cache available
    end
    GHA->>Turbo: Run build/test tasks
    Turbo->>Turbo: Execute tasks (use cache if available)
    Turbo-->>TurboCache: Store new outputs in cache
    TurboCache-->>GHA: Cache updated
    GHA->>Artifacts: Upload build artifacts (Linux only)
    Note over GHA: Cache Report: HIT/MISS summary

    Note over GHA,Artifacts: E2E/Package/Unit Test Workflows
    GHA->>Setup: Checkout & Setup Node/PNPM
    Setup-->>GHA: Environment Ready
    GHA->>Artifacts: Download build artifacts
    Artifacts-->>GHA: Artifacts restored
    GHA->>TurboCache: rharkor/caching-for-turbo@v1
    TurboCache->>TurboCache: Check GitHub cache for task outputs
    alt Cache Hit
        TurboCache-->>Turbo: Restore cached test app builds
    else Cache Miss
        TurboCache-->>Turbo: No cache available
    end
    GHA->>Turbo: Run test tasks
    Turbo->>Turbo: Execute tests (rebuild apps if cache miss)
    Turbo-->>TurboCache: Store new outputs in cache
    TurboCache-->>GHA: Cache updated
    Note over GHA: Cache Report: HIT/MISS summary

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[greptile-apps]

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