Resolve "auto-expire of vouchers"

Closes #197 (closed)

added 2 commits

• 41af46a4 - cron job for marking vouchers as expired
• 724e90b5 - unit tests for expire voucher cron job

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unmarked as a Work In Progress

enabled an automatic merge when the pipeline for 724e90b5 succeeds

merged

mentioned in commit 14d59269