Fix main build: add missing egress endpoints to harden-runner

[spoorcc]

Summary

• Add release-assets.githubusercontent.com:443 to source-provenance.yml — needed by slsa_with_provenance to download the slsa-source-corroborator binary from GitHub releases
• Add timestamp.githubapp.com:443 to source-provenance.yml, build.yml, and test.yml — needed by actions/attest and actions/attest-build-provenance when signing DSSE attestation wrappers
• Add uploads.github.com:443 to the build-whl job in build.yml — needed for artifact upload

All three endpoints were blocked by the harden-runner egress policy, cascading into build and test failures on main.

Test plan

• source-provenance workflow passes on main (both attest-source-governance and attest-source jobs)
• build workflow passes (binary and wheel jobs complete attestation steps)
• test workflow passes attestation step

https://claude.ai/code/session_01FzXNiF3f5iEnRPX3SWfd2A

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Generated by Claude Code

Summary by CodeRabbit

• Chores
  • Enhanced CI/CD pipeline security configurations across build, testing, and attestation workflows to improve overall system reliability and security posture during the release process.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 39d3be89-80bc-48ec-af12-8f0ce243ef54

📥 Commits

Reviewing files that changed from the base of the PR and between 79444c8 and 23f8ebc.

📒 Files selected for processing (3)

• .github/workflows/build.yml
• .github/workflows/source-provenance.yml
• .github/workflows/test.yml

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Walkthrough

This PR expands the egress allowlist in GitHub Actions runner hardening across three workflows. The build.yml workflow permits timestamp verification for builds and wheel creation. The test.yml workflow permits timestamp access during testing. The source-provenance.yml workflow permits release asset uploads and timestamp verification during provenance attestation.

Changes

CI Workflow Egress Allowlist Updates

Layer / File(s)	Summary
Build and wheel build hardening .github/workflows/build.yml	Build and build-whl jobs add timestamp.githubapp.com:443 and uploads.github.com:443 to the allowed-endpoints list for runner hardening.
Test job hardening .github/workflows/test.yml	Test job adds timestamp.githubapp.com:443 to the allowed-endpoints list for runner hardening.
Source provenance attestation hardening .github/workflows/source-provenance.yml	Attestation jobs add timestamp.githubapp.com:443, uploads.github.com:443, and release-assets.githubusercontent.com:443 to their allowed-endpoints lists for runner hardening.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• dfetch-org/dfetch#1199: Adds SLSA source-provenance and VSA attestation steps that require the expanded egress allowlist for timestamp and asset verification.
• dfetch-org/dfetch#1212: Updates source-provenance.yml allowlist in the attest-source-governance job with related GitHub domain changes.
• dfetch-org/dfetch#1190: Previously modified step-security/harden-runner allowed-endpoints in build.yml and other workflows.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the primary change: adding missing egress endpoints to harden-runner configurations across multiple workflows to fix build failures.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/fix-main-build-cCB7E

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[spoorcc]

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