ci(deps): let Dependabot propose dependency and action updates - #197
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The workflow actions are pinned to commit SHAs rather than tags, which is what makes this worth configuring: a pinned SHA never moves on its own, so without something proposing new ones the pins quietly rot, and resolving them by hand is exactly the motion the pinning exists to prevent. Dependabot resolves each new SHA, names the release it belongs to, and opens one reviewable pull request. Five graphs are covered: the actions, the Go modules, the two browser workspaces (separate on purpose, each with its own overrides block pinning security fixes) and the npm-based documentation site. Minor and patch updates are grouped per ecosystem so a week of drift arrives as one pull request; majors are left ungrouped so they arrive alone, since those are the ones that need someone to read the migration notes. Note that Bun is a version-updates-only ecosystem for Dependabot — it does not receive security updates, so `bun audit` in `just check` stays the gate for those. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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The workflow actions are pinned to commit SHAs rather than tags, which is what makes this worth configuring: a pinned SHA never moves on its own, so without something proposing new ones the pins quietly rot, and resolving them by hand is exactly the motion the pinning exists to prevent. Dependabot resolves each new SHA, names the release it belongs to, and opens one reviewable pull request. Five graphs are covered: the actions, the Go modules, the two browser workspaces (separate on purpose, each with its own overrides block pinning security fixes) and the npm-based documentation site. Minor and patch updates are grouped per ecosystem so a week of drift arrives as one pull request; majors are left ungrouped so they arrive alone, since those are the ones that need someone to read the migration notes. Note that Bun is a version-updates-only ecosystem for Dependabot — it does not receive security updates, so `bun audit` in `just check` stays the gate for those.
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Adds
.github/dependabot.yml. No dependency changes in this PR — it configures the thing that will propose them.Why this rather than a hand-written bump. All 15 workflow actions are pinned to commit SHAs, not tags. A pinned SHA never moves on its own, so without something proposing new ones the pins quietly rot — and resolving them by hand means trusting that a given SHA really is the commit a release tag points at, which is precisely the check the pinning exists to enforce. Dependabot does that resolution, names the release, and opens one reviewable PR per action.
Five graphs covered
github-actions/gomod/bun/ui/hostoverridesblockbun/ui/appsoverridesblocknpm/sitepackage-lock.json, not bunMinor and patch updates are grouped per ecosystem so a week of drift arrives as one PR instead of a dozen. Majors are deliberately left out of the groups so they arrive alone — those are the ones someone has to read migration notes for.
One limitation worth knowing: Bun is a version-updates-only ecosystem for Dependabot; it does not receive security updates.
bun auditinjust checkremains the gate for those, and theoverridesblocks remain the mechanism for pinning fixes.Weekly schedule, conventional-commit prefixes matching the repo's existing style.
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