update

@@ -4,4 +4,6 @@ RUN mkdir -p /opt/work/hro/frontend/hro
 
 COPY . /opt/work/hro/frontend/hro/server/
 
-WORKDIR /opt/work/hro/frontend/hro
\ No newline at end of file
+WORKDIR /opt/work/hro/frontend/hro
+
+EXPOSE 3000
\ No newline at end of file