Add code coverage CI (cargo-llvm-cov + Codecov)#12
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Adds a new GitHub Actions workflow that runs `cargo llvm-cov` against
each in-tree Rust crate (`release-manager`, `mina-bench-upload`,
`buildkite-cache-manager`) and uploads LCOV reports to Codecov.
Matrix-per-crate setup:
* Each crate runs as its own job so one crate's failure doesn't
poison the others.
* Each upload is tagged with a Codecov *flag* matching the crate
name, so PRs see per-crate coverage deltas in the comment.
* `fail-fast: false` and `fail_ci_if_error: false` keep the workflow
advisory — coverage is observation, not a gate (yet).
`codecov.yml` defines the per-crate flags + paths, ignores the three
submodules (their coverage lives in their own repos), and sets the
informational project / patch thresholds:
* project: target auto, threshold 1% (allows small drift)
* patch: target 70% on new code
Both with `if_ci_failed: ignore` so the build stays green while we're
still calibrating. Once we have a few weeks of trend data per crate
we can tighten these to enforceable thresholds.
The Codecov action accepts uploads from public-repo PRs without a
token. A `CODECOV_TOKEN` repo secret can be added later to avoid rate
limits at higher volume.
Per-crate README badges are intentionally not added here — they'd be
noise until Codecov has actually ingested a run. Add them in a
follow-up once data lands.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2 tasks
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Summary
New `.github/workflows/coverage.yml` running `cargo llvm-cov` against each in-tree Rust crate (`release-manager`, `mina-bench-upload`, `buildkite-cache-manager`) and uploading LCOV reports to Codecov with per-crate flags.
What's in the workflow
codecov.yml
Sits at the repo root. Defines:
Once each crate has a few weeks of trend data we can tighten these into real gates.
Codecov token
The workflow references `secrets.CODECOV_TOKEN` but tolerates its absence — Codecov accepts uploads from public-repo PRs token-free. Add the secret later if uploads start being rate-limited.
Not in this PR
Test plan
🤖 Generated with Claude Code