feat: updates docker file by exposing the tracing port 26661 (celesti…

…aorg#3334)

The port `:26661` needs to be exposed in order to access traced data.
Please see
https://github.com/celestiaorg/celestia-core/tree/main/pkg/trace#pull-based-event-collection.
Part of celestiaorg#3318

Dockerfile

@@ -65,5 +65,6 @@ WORKDIR ${CELESTIA_HOME}
 # 26656 is the default node p2p port.
 # 26657 is the default RPC port.
 # 26660 is the port used for Prometheus.
-EXPOSE 1317 9090 26656 26657 26660
+# 26661 is the port used for tracing.
+EXPOSE 1317 9090 26656 26657 26660 26661
 ENTRYPOINT [ "/bin/bash", "/opt/entrypoint.sh" ]