Update to Nextcloud+Redis>=6

[Alex Graber]

I've been experimenting with transitioning to Redis>6. Here are the changes I had to make to your setup:

users.acl:

user default on >SOME_STRONG_PASSWORD ~* &* +@all 

redis.conf (note: incomplete; these are just the modifications I found were required):

...
bind nextcloud-redis  # bind to redis container-name
...
aclfile /run/secrets/ACL_SECRET_NAME
...

docker-compose.yml

secrets:
  ACL_SECRET_NAME:
    - ./users.acl

services:
  nextcloud-redis:
    image: redis:alpine
    container_name: nextcloud-redis
    secrets:
      - ACL_SECRET_NAME
    command: redis-server /usr/local/etc/redis/redis.conf
    volumes:
      - ./redis.conf:/usr/local/etc/redis/redis.conf

[noone-g]

It looks like the authentication problem is solved since Jun. 2021. It was the redis docker problem. I am using the latest redis without any modification and see no errors.