security: SHA-pin GitHub Actions + add Dependabot#1
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Replaces tag-based uses: refs with immutable commit SHAs. Closes the attack class where a compromised action tag (e.g., the Mar 2026 reviewdog incident) gets picked up automatically on next workflow run. - actions/checkout@v4 -> @34e114876b0b11c390a56381ad16ebd13914f8d5 - actions/setup-python@v5 -> @a26af69be951a213d495a4c3e4e4022e16d87065 Adds .github/dependabot.yml to keep the pins fresh. Part of platform-wide supply chain hardening Phase 1. Plan: herakles-linux-opus/supply-chain-audit/SYSTEMIC_HARDENING_PLAN.md Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Part of platform-wide workflow hardening (Supply Chain Audit Phase 1). Companion PR to herakles-dev/anvil#1 (pilot, merged).
Replaces tag-based action refs with immutable commit SHAs + adds Dependabot to keep pins fresh.
Why
Tag refs like
uses: actions/checkout@v4are mutable. Anyone with push access to the action repo can retargetv4at a malicious commit; subsequent CI runs pick it up silently — the March 2026 reviewdog incident shape.SHA-pinning makes the ref immutable. Dependabot keeps it current.
Changes
.github/workflows/test.yml— 2 action refs pinned:actions/checkout@v4→@34e114876b0b11c390a56381ad16ebd13914f8d5(v4)actions/setup-python@v5→@a26af69be951a213d495a4c3e4e4022e16d87065(v5).github/dependabot.yml— new; weekly bumps ongithub-actionsecosystem.Verification
SHAs resolved via `gh api repos/actions/{action}/commits/{tag}`.
Test plan
Reference: `herakles-linux-opus/supply-chain-audit/SYSTEMIC_HARDENING_PLAN.md`
🤖 Generated with Claude Code