Fix documentation build (#667)

The custom container does not seem to work anymore with recent ecosystem
changes. It was originally introduced in
#508

However, the Tensorflow build issues seem to be gone.

Author: danieldk

.github/workflows/build_documentation.yml

@@ -18,7 +18,6 @@ jobs:
       package_path: safetensors/bindings/python/
       version_tag_suffix: bindings/python/py_src/
       install_rust: true
-      custom_container: huggingface/transformers-doc-builder
     secrets:
       token: ${{ secrets.HUGGINGFACE_PUSH }}
       hf_token: ${{ secrets.HF_DOC_BUILD_PUSH }}

.github/workflows/build_pr_documentation.yml

@@ -21,4 +21,3 @@ jobs:
       package_path: safetensors/bindings/python/
       version_tag_suffix: bindings/python/py_src/
       install_rust: true
-      custom_container: huggingface/transformers-doc-builder