LinuxServer Changes:
Rebase to alpine 3.12. Fix APP_URL setting. Bump php post max and upload max filesizes to 100MB by default.
bookstack Changes:
Security Release
This release addresses an issue where page content could be visible to those without permission. If a chapter was visible to a user, but all of it's pages were made not visible, then the details of these pages could be visible. Within the BookStack interface, the names of the pages and preview content could be seen. If the parent book was exported then this would include the content of the pages that had been restricted.
Further details can be found in the vulnerability report.