docs: correct the scheduler guidance for Docker - #25
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The recurring invoices page told Docker users that cron was handled for them "on version 5.0.0 by default", which was never true of any InvoiceShelf image: none of them ran a scheduler, so recurring invoices were never created and this page was the reason nobody investigated. Current images supervise the scheduler themselves. Documents that, names the SCHEDULER_ENABLED escape hatch, and adds the option for hosts that can run neither a crontab nor a long-running process: the cron webhook, its CRON_JOB_AUTH_TOKEN secret and the header it expects, which were undocumented.
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The recurring invoices page told Docker users cron was "included with docker on version 5.0.0 by default". That was never true of any InvoiceShelf image, so recurring invoices were never created and this page is much of why nobody investigated.
InvoiceShelf/InvoiceShelf#782 and #783 add a supervised scheduler to the image. This documents it, names the
SCHEDULER_ENABLEDescape hatch, and documents the cron webhook for hosts that can run neither a crontab nor a long-running process. Its endpoint, secret and header were never mentioned anywhere.