fix: hf-doc-builder insallation was failing (#45225)

* the dev extra now installs hf-doc-builder as well

* use main

Author: tarekziade

docker/transformers-doc-builder/Dockerfile

@@ -4,7 +4,11 @@ LABEL maintainer="Hugging Face"
 RUN apt update
 RUN git clone https://github.com/huggingface/transformers
 
-RUN python3 -m pip install --no-cache-dir --upgrade pip && python3 -m pip install --no-cache-dir git+https://github.com/huggingface/doc-builder ./transformers[dev]
+RUN python3 -m pip install --no-cache-dir --upgrade pip && python3 -m pip install --no-cache-dir ./transformers[dev]
+
+# We want to use the latest doc-builder when building docs
+RUN python3 -m pip install -U git+https://github.com/huggingface/doc-builder.git@main
+
 RUN apt-get -y update && apt-get install -y libsndfile1-dev && apt install -y tesseract-ocr
 
 # Torch needs to be installed before deepspeed
@@ -15,4 +19,4 @@ RUN python3 -m pip install -U "itsdangerous<2.1.0"
 
 # Test if the image could successfully build the doc. before publishing the image
 RUN doc-builder build transformers transformers/docs/source/en --build_dir doc-build-dev --notebook_dir notebooks/transformers_doc --clean
-RUN rm -rf doc-build-dev
+RUN rm -rf doc-build-dev