feat(api): add GitHub webhook receiver for evented refresh#1317
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POST /api/v1/webhooks/github turns a verified push into an immediate refresh of the matching managed checkout, so server state tracks GitHub without waiting for the next interval tick. The interval loop stays as a backstop. - The route bypasses the session/CSRF gate (GitHub carries neither) but stays rate-limited, mirroring how /config is mounted on the public mux. It is authenticated solely by the X-Hub-Signature-256 HMAC and fails closed (404) when STACKIT_GITHUB_WEBHOOK_SECRET is unset, so it is never an open trigger — the correct posture for local/dev servers GitHub cannot reach. - The handler acks immediately (202) and runs the mirror-fetch in the background, since a fetch can outlast GitHub's delivery timeout. Coalescing bursts is a follow-up. - The shared *reposync.Syncer is now built once in NewServer (guarding the typed-nil provider trap) and drives both the interval loop and the webhook, so on-demand refresh works even with the loop disabled. handlers depends on it only through a narrow RepoSyncer interface.
This was referenced Jun 23, 2026
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POST /api/v1/webhooks/github turns a verified push into an immediate refresh of
the matching managed checkout, so server state tracks GitHub without waiting for
the next interval tick. The interval loop stays as a backstop.
rate-limited, mirroring how /config is mounted on the public mux. It is
authenticated solely by the X-Hub-Signature-256 HMAC and fails closed (404)
when STACKIT_GITHUB_WEBHOOK_SECRET is unset, so it is never an open trigger —
the correct posture for local/dev servers GitHub cannot reach.
background, since a fetch can outlast GitHub's delivery timeout. Coalescing
bursts is a follow-up.
typed-nil provider trap) and drives both the interval loop and the webhook,
so on-demand refresh works even with the loop disabled. handlers depends on it
only through a narrow RepoSyncer interface.
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