Schedule a recurring Inngest function with a cron trigger and a specific timezone

Documented steps

1. Use a cron trigger inside the config object: `inngest.createFunction({ id: "prepare-weekly-digest", triggers: { cron: "TZ=Europe/Paris 0 12 * * 5" } }, async ({ step }) => { /* ... */ });`
2. Prefix the 5-field cron expression with `TZ=<IANA timezone>` to pin it to a zone; without the prefix it is evaluated in UTC.
3. Add `jitter` to spread load when many functions share a schedule: `{ cron: "0 * * * *", jitter: "5m" }`. Jitter must be between 1 second and 5 minutes.
4. Combine schedules and events on one function by passing an array of triggers: `triggers: [{ event: "user.created" }, { event: "user.updated" }, { cron: "0 5 * * *" }]`. Ref: https://www.inngest.com/docs/guides/multiple-triggers
5. Branch inside the handler on whether `event` is a scheduled invocation or a user event when using multiple triggers.
6. Wrap the actual work in `step.run` so a mid-run failure does not repeat completed work on the automatic retry.
7. Verify the next scheduled time in the Inngest dashboard after syncing — cron functions only appear once the app is synced.