Added server port

Dockerfile

@@ -2,6 +2,7 @@ FROM ubuntu:22.04
 
 # parameters that might be provided at runtime by using the --env option
 ENV BACKEND_URL=""
+ENV SERVER_PORT=8501
 
 # install dependencies
 ENV DEBIAN_FRONTEND=noninteractive
@@ -21,6 +22,8 @@ EXPOSE $SERVER_PORT
 # set all environment variables
 ENTRYPOINT ["sh", "-c", "\
     export BACKEND_URL=$BACKEND_URL \
+    export SERVER_PORT=$SERVER_PORT \
     && echo \"BACKEND_URL: $BACKEND_URL\" \
+    && echo \"SERVER_PORT: $SERVER_PORT\" \
     && streamlit run client.py --server.port=$SERVER_PORT --server.address=0.0.0.0 \
 "]