Update Dockerfile

Dockerfile

@@ -13,4 +13,5 @@ ENV TOKENIZERS_PARALLELISM=false \
     ACCELERATE_USE_DEEPSPEED=true
 
 COPY README.md /tmp/README.md
-ENV STARTUP_DURATION_TIMEOUT=$(grep -oP '(?<=^startup_duration_timeout:\s).*' /tmp/README.md)
+RUN STARTUP_TIMEOUT=$(awk '/^startup_duration_timeout:/ {print $2}' /tmp/README.md) && \
+    echo "export STARTUP_DURATION_TIMEOUT=$STARTUP_TIMEOUT" >> ~/.bashrc