Matthias Clasen 39e9ef54be docs: Add initial support for using gi-docgen for docs
The files here are copied from the docs-gtk-org
branch of gtk.

This adds gi-docgen to the CI Dockerfiles and ensures the new versions
(including the OS upgrades from the previous commit) are used during CI.

Helps: #3037
2023-10-11 14:01:28 +01:00
..
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