Add zip package to doc builder image (#8284)

update

Author: DN6

docker/diffusers-doc-builder/Dockerfile

@@ -18,6 +18,7 @@ RUN apt install -y bash \
                    python3.10 \
                    python3-pip \
                    libgl1 \
+                   zip \
                    python3.10-venv && \
     rm -rf /var/lib/apt/lists