fix docker port

Author: krichprollsch

Dockerfile

@@ -74,4 +74,6 @@ COPY --from=0 /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.
 
 COPY --from=0 /browser/zig-out/bin/lightpanda /bin/lightpanda
 
-CMD ["/bin/lightpanda", "--host", "0.0.0.0", "--port", "3245"]
+EXPOSE 9222/tcp
+
+CMD ["/bin/lightpanda", "--host", "0.0.0.0", "--port", "9222"]