Mention scheduling the workflow with cron

README.md

@@ -27,3 +27,12 @@ Each of those Playwright canaries can be individually, locally invoked like so:
 ```bash
 $ npm run healthcheck -- src/canaries/playwright-total-typescript.ts
 ```
+
+To get the canaries to run every hour on the hour, you'd eventually want to add
+a `schedule` directive to the workflow using this cron syntax:
+
+```yml
+on:
+  schedule:
+    - cron: '0 * * * *'
+```