Iss #141 - Add DB-backed GH installation cache for better uptime

Previously, we cached installation info live at server start, but this had awful performance and due to GH API instability, was not reliable. The new solution should be more stable and better handle disruptions. This will initially be updated hourly by a thread, and in the future will have updates performed by the already configured webhook.

requested review from @zacharysabourin

added 1 commit

• 17b75791 - Iss #141 (closed) - Add DB-backed GH installation cache for better uptime

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mentioned in commit c479ed3a