ci: cache workspace crate artifacts in integration build

[desmondcheongzx]

Add cache-workspace-crates: "true" to the Swatinem/rust-cache config for the integration-test-build job.

cache-all-crates only controls registry cleanup (downloaded .crate files and extracted sources in ~/.cargo/registry/). Workspace crate fingerprints, build script outputs, and compiled .rlib/.rmeta artifacts in target/ are cleaned by cleanTargetDir() during cache save — which builds its keep-list from getPackagesOutsideWorkspaceRoot(), explicitly excluding workspace members. This caused all ~70 local crates to recompile from scratch every run (~25 min at opt-level=3).

cache-workspace-crates: "true" adds workspace members to the keep-list so their artifacts survive the save cleanup.

Results

Tested on this PR with temporary save-if: true to bootstrap the cache:

Metric	Cold cache	Warm cache
Cache restore	2s	21s
Build wheels	36 min	10 sec
Total job	~37 min	~1 min 41 sec

Combined with the restore-mtime fix from #6246 (source file mtimes older than cached dep-info mtimes), cargo now sees all workspace crates as fresh.

See #6244, #6246.

[greptile-apps]

Greptile Summary

This PR adds cache-workspace-crates: "true" to the Swatinem/rust-cache configuration for the integration-test-build job. This change preserves compiled artifacts for all ~70 workspace crates in the target/ directory, preventing them from being cleaned during cache save operations.

Key changes:

• Enables cache-workspace-crates: "true" to include workspace member artifacts in the keep-list
• Temporarily sets save-if: true to bootstrap the cache (marked with TODO to revert before merge)
• Works in conjunction with the mtime restoration from ci: share rust cache across branches and restore file mtimes #6246 to ensure cargo sees workspace crates as fresh

Expected impact:

• Reduces integration build time by ~25 minutes by avoiding recompilation of unchanged workspace crates
• First build after merge will save the new cache format; subsequent builds should only recompile changed crates

Confidence Score: 5/5

• This PR is safe to merge after reverting the temporary save-if setting
• The change is a straightforward CI optimization that adds a single configuration option to cache workspace crates. The implementation follows the action's documented behavior, builds on the mtime fix from ci: share rust cache across branches and restore file mtimes #6246, and includes a clear TODO for the temporary bootstrap setting
• Verify that the TODO comment on lines 342-344 is addressed before merge (revert save-if: true to main-only)

Important Files Changed

Filename	Overview
.github/workflows/pr-test-suite.yml	Adds cache-workspace-crates: "true" to preserve compiled workspace artifacts, temporarily enables save-if: true for cache bootstrap (needs revert before merge)

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Checkout with fetch-depth: 0] --> B[Restore file mtimes from git history]
    B --> C[Setup Rust with cache: false]
    C --> D[Swatinem/rust-cache restore]
    D --> E{Cache hit?}
    E -->|Yes| F[Restore target/ with workspace artifacts]
    E -->|No| G[Cold build all crates]
    F --> H[Cargo checks mtimes vs dep-info]
    H --> I{Files fresh?}
    I -->|Yes| J[Skip recompilation]
    I -->|No| K[Recompile changed crates only]
    G --> L[Build wheels]
    J --> L
    K --> L
    L --> M{On main branch or save-if: true?}
    M -->|Yes| N[Save cache with workspace artifacts]
    M -->|No| O[Skip cache save]
    N --> P[Upload wheels]
    O --> P

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_{Last reviewed commit: 50be6b2}

[greptile-apps]

_{1 file reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

Revert save-if: true to save-if: ${{ github.ref == 'refs/heads/main' }} before merge

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.43%. Comparing base (94c6f30) to head (5ef868e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6261      +/-   ##
==========================================
- Coverage   73.43%   73.43%   -0.01%     
==========================================
  Files        1001     1001              
  Lines      133185   133096      -89     
==========================================
- Hits        97808    97733      -75     
+ Misses      35377    35363      -14     

see 5 files with indirect coverage changes

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