Dockerfile doesn't specify USER

### Description

By not specifying a USER, a program in the container may run as root. This is a security hazard. If an attacker can control a process running as root, they may have control over the container. Ensure that the last USER in a Dockerfile is a USER other than root.

images/orderer/Dockerfile:73
{CMD [ "orderer", "start" ]}

images/peer/Dockerfile:77

{VOLUME /etc/hyperledger/fabric
VOLUME /var/hyperledger

EXPOSE 7051

CMD [ "peer", "node", "start" ]}

References

https://owasp.org/Top10/A04_2021-Insecure_Design

### Steps to reproduce

_No response_