fix: run codecov on buildjet

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• codecov runs on GH workers are constantly timing out, let's switch back to buildjet.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Summary by CodeRabbit

• Chores
  • Optimized CI/CD infrastructure for improved build efficiency.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Updated the GitHub Actions workflow configuration to use a different runner image (buildjet-4vcpu-ubuntu-2204 instead of ubuntu-24.04-arm) and reduced the coverage job timeout from 60 to 45 minutes.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Configuration .github/workflows/coverage.yml	Changed runner label from ubuntu-24.04-arm to buildjet-4vcpu-ubuntu-2204 and reduced job timeout from 60 to 45 minutes

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix(ci): use large timeout for codecov CI job #6406 — Modifies the same coverage workflow file with opposite changes to job timeout and runner configuration
• chore: resurrect codecov reports #6324 — Directly alters workflow runner and timeout settings in the same coverage workflow file
• fix: try re-enable buildjet for RPC checks #6201 — Switches GitHub Actions runner labels to BuildJet images across workflow files

Suggested labels

github_actions

Suggested reviewers

• sudo-shashank
• hanabi1224

🚥 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 'fix: run codecov on buildjet' directly and clearly describes the primary change: switching the Codecov runner from GitHub Actions to BuildJet.
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.}

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📜 Recent review details

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7eb7569 and 8e60acf.

📒 Files selected for processing (1)

• .github/workflows/coverage.yml

🧰 Additional context used

🧠 Learnings (1)

📓 Common learnings

Learnt from: LesnyRumcajs
Repo: ChainSafe/forest PR: 5907
File: src/rpc/methods/state.rs:523-570
Timestamp: 2025-08-06T15:44:33.467Z
Learning: LesnyRumcajs prefers to rely on BufWriter's Drop implementation for automatic flushing rather than explicit flush() calls in Forest codebase.

🪛 actionlint (1.7.10)

.github/workflows/coverage.yml

46-46: label "buildjet-4vcpu-ubuntu-2204" is unknown. available labels are "windows-latest", "windows-latest-8-cores", "windows-2025", "windows-2022", "windows-11-arm", "ubuntu-slim", "ubuntu-latest", "ubuntu-latest-4-cores", "ubuntu-latest-8-cores", "ubuntu-latest-16-cores", "ubuntu-24.04", "ubuntu-24.04-arm", "ubuntu-22.04", "ubuntu-22.04-arm", "macos-latest", "macos-latest-xlarge", "macos-latest-large", "macos-26-xlarge", "macos-26", "macos-15-intel", "macos-15-xlarge", "macos-15-large", "macos-15", "macos-14-xlarge", "macos-14-large", "macos-14", "self-hosted", "x64", "arm", "arm64", "linux", "macos", "windows". if it is a custom label for self-hosted runner, set list of labels in actionlint.yaml config file

(runner-label)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (8)

• GitHub Check: Build MacOS
• GitHub Check: cargo-publish-dry-run
• GitHub Check: Build Ubuntu
• GitHub Check: Build forest binaries on Linux AMD64
• GitHub Check: Coverage
• GitHub Check: All lint checks
• GitHub Check: tests-release
• GitHub Check: rubocop

🔇 Additional comments (1)

.github/workflows/coverage.yml (1)

46-47: Architecture change from ARM to x86_64 — verify compatibility.

The runner switch from ubuntu-24.04-arm (ARM64) to buildjet-4vcpu-ubuntu-2204 (x86_64) changes the build architecture. While this should generally work, ensure that:

1. The sccache bucket has cached artifacts for x86_64 builds
2. Any architecture-specific dependencies or proof parameters are compatible

The actionlint warning about the unknown label is a false positive—BuildJet runner labels are valid third-party self-hosted runners.

Reducing the timeout from 60 to 45 minutes while moving to BuildJet seems reasonable given their typically faster infrastructure.

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