install wget. (#8285)

Author: sayakpaul

docker/diffusers-doc-builder/Dockerfile

@@ -19,6 +19,7 @@ RUN apt install -y bash \
                    python3-pip \
                    libgl1 \
                    zip \
+                   wget \
                    python3.10-venv && \
     rm -rf /var/lib/apt/lists