Use docker to build reids to specify the configuration file. If you use docker run to set it, the configuration file redis.conf is valid:

docker run -d -ti \
 -p 6379:6379 \
 -v /home/docker/redis/conf/redis.conf:/etc/redis/redis.conf \
 --restart always \
 --name pos_redis \
 redis:3.0.6 \
 redis-server /etc/redis/redis.conf

However, the configuration file will not take effect in the way of docker-compose and dockerfile, and the default configuration file will be used automatically:
docker-compose.yml

version: "3"
 services:
 redis:
 container_name: redis_service
 build:
 context: ./redis
 dockerfile: Dockerfile
 ports:
 - "6379:6379"
 volumes:
 - /home/docker/redis/conf/redis.conf:/etc/redis/redis.conf
 networks:
 - "net1"
 networks:
 net1:
 driver: bridge

dockerfile

FROM redis:3.0.6
 ENV TIME_ZONE Asia/Shanghai
 RUN usermod -u 1000 www-data \
 && apk add --no-cache tzdata \
 && echo "${TIME_ZONE}" > /etc/timezone \
 && ln -sf /usr/share/zoneinfo/${TIME_ZONE} /etc/localtime \
 && redis-server /etc/redis/redis.conf

What is the difference between the two ways of running commands?
—————————————————————————
Supplement, use
ENTRYPOINT redis-server /etc/redis/redis.conf
Nor will it be implemented