Add option to our build system for caching the wiki
_Originally created by @anonym on [#15342 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/15342)_
Feature Branch: feature/15342-cache-wiki
### Related issues
- **Related to** tails/tails#15864
- **Blocks** tails/tails#17439
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