Optimized Docker build to fix OOM errors

Dockerfile

@@ -15,8 +15,7 @@ ENV MAX_JOBS=1
 
 # Install nvdiffrast (CUDA rasterizer) - needs GPU, build here
 RUN git clone --depth 1 https://github.com/NVlabs/nvdiffrast.git /tmp/nvdiffrast \
-    && cd /tmp/nvdiffrast \
-    && python3 setup.py install \
+    && python3 -m pip install /tmp/nvdiffrast --no-build-isolation \
     && python3 -c "import nvdiffrast.torch" \
     && rm -rf /tmp/nvdiffrast