Singleruser docker install req step fix.

Author: vladd-bit

Dockerfile_singleuser

@@ -214,9 +214,9 @@ RUN uv pip install --upgrade --system pip setuptools wheel
 COPY ./requirements.txt /srv/jupyterhub/
 
 RUN if [ "$GPU_BUILD" = "true" ] && [ "$CPU_ARCHITECTURE" = "amd64" ]; then \
-      uv pip install --system --no-cache-dir -r /srv/jupyterhub/requirements.txt \
+      uv pip install --system --no-cache-dir -r /srv/jupyterhub/requirements.txt ; \
     else \
-      uv pip install --system --no-cache-dir -r /srv/jupyterhub/requirements.txt --extra-index-url https://download.pytorch.org/whl/cpu/ \
+      uv pip install --system --no-cache-dir -r /srv/jupyterhub/requirements.txt --extra-index-url https://download.pytorch.org/whl/cpu/ ; \
     fi
 
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