Use CMD in Dockerfile

According to Dockerfile best practices
(https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#entrypoint)
the best use for ENTRYPOINT is to set the image’s main command and then
use CMD as the default flags. This makes it easier to change the flags
passed to monerod when running the Docker image.

Dockerfile

@@ -61,5 +61,6 @@ EXPOSE 18081
 # switch to user monero
 USER monero
 
-ENTRYPOINT ["monerod", "--p2p-bind-ip=0.0.0.0", "--p2p-bind-port=18080", "--rpc-bind-ip=0.0.0.0", "--rpc-bind-port=18081", "--non-interactive", "--confirm-external-bind"]
+ENTRYPOINT ["monerod"]
+CMD ["--p2p-bind-ip=0.0.0.0", "--p2p-bind-port=18080", "--rpc-bind-ip=0.0.0.0", "--rpc-bind-port=18081", "--non-interactive", "--confirm-external-bind"]