Update Dockerfile

Dockerfile

@@ -1,3 +1,3 @@
 FROM huggingface/autotrain-advanced:latest
-ENV OMP_NUM_THREADS=1
-CMD pip uninstall -y autotrain-advanced && pip install -U autotrain-advanced && autotrain app --host 0.0.0.0 --port 7860 --workers 1
+RUN pip uninstall -y autotrain-advanced && pip install -U autotrain-advanced
+CMD export OMP_NUM_THREADS=1 && autotrain app --host 0.0.0.0 --port 7860 --workers 1