Docker: Run ldconfig after we install everything to rebuild `ld.so.…

…cache` and

work around this failure on Debian: NVIDIA/nvidia-docker#1399

docker/Dockerfile

@@ -132,7 +132,8 @@ RUN if [[ "${OS_TYPE}" == "ubuntu"* ]]; then \
       export CUDACXX=$(which nvc++); \
       ${ALTERNATIVES} --install /usr/bin/cu++ cu++ $(which nvc++) 99; \
       ${ALTERNATIVES} --set cu++ $(which nvc++); \
-    fi;
+    fi; \
+    ldconfig;
 
 ENTRYPOINT [ "/usr/bin/tini", "--" ]
 CMD [ "/bin/bash" ]