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chore: add Dependabot version updates for GitHub Actions (Actions only, not cargo) - #309

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chore: add Dependabot version updates for GitHub Actions (Actions only, not cargo)#309
tamashi095 wants to merge 1 commit into
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codex/dependabot-github-actions

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@tamashi095

@tamashi095 tamashi095 commented Sep 1, 2026

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Summary

Adds .github/dependabot.yml covering only the github-actions ecosystem, monthly, grouped into a single PR. No pre-existing Dependabot/Renovate config was found in this repo.

This is a deliberately scoped-down companion to the drift-detection work in misofm/app (see that PR for the full Dependabot-vs-Renovate evaluation). The full writeup recommended evaluating cargo coverage for this repo separately rather than bundling it into this change.

Why Actions-only, not cargo

This workspace builds --locked everywhere and has a bit-determinism invariant enforced by the "cross-target digest gates under wasmtime" required check. An automated Cargo dependency bump can move a shipped digest -- a materially bigger deal than a routine app dependency bump. I'm not confident enough to auto-enable that without guardrails, so it's left as a recommendation, not implemented:

  • If enabled, group all cargo updates into a single low-frequency (monthly, not weekly) PR, capped at 1 open PR, no automerge ever.
  • Treat the digest gate as the safety net it already is (it's a required check), but expect it to catch problems after CI cost has already been paid, not before.
  • Actions bumps carry none of this risk since they never touch Cargo.lock or a shipped digest.

CI cost

Every PR here triggers the full required-check suite regardless of what changed: cross-target digest gates, chromium/firefox/webkit browser qualification, and host quality on an 8-vcpu runner -- meaningfully more expensive than a typical app PR. Monthly scheduling with everything grouped into one PR means at most ~1 extra full CI run/month from this bot, only when an Actions version actually moved.

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Covers the actions/checkout@v4-class drift the app repo also has, without
touching the cargo ecosystem. This workspace builds --locked everywhere
and enforces a bit-determinism invariant (cross-target digest gates); an
automated Cargo dependency bump can move a shipped digest, which needs
guardrails this PR doesn't set up. See PR description for the full
reasoning and recommendation.

Monthly schedule (not weekly): every PR here triggers the full required
check suite, including cross-target digest gates and chromium/firefox/
webkit browser qualification, which is materially more expensive than
the app's CI. Actions bumps are low-urgency, so there's no reason to pay
that weekly.
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