Tests to speed up docs

[Wauplin]

Related to huggingface/doc-builder#487 and internal slack thread. There is now a custom_container option when building docs in CI. When set to "" (instead of "huggingface/transformers-doc-builder" by default), we don't run the CI inside a container, therefore saving ~2min of download time. The plan is to test disabling the transformers container on a few "big" repo and if everything works correctly, we will stop making it the default container. More details on huggingface/doc-builder#487.

cc @mishig25

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.81%. Comparing base (3252e27) to head (3108fdb).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2140      +/-   ##
==========================================
+ Coverage   82.70%   82.81%   +0.10%     
==========================================
  Files         103      103              
  Lines        9628     9670      +42     
==========================================
+ Hits         7963     8008      +45     
+ Misses       1665     1662       -3     

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[Wauplin]

Dropping this now that huggingface/doc-builder#487 has been successfully merged :)