Here is a quick and dirty nextcloud docker-compose

<span style="color:#323232;">services:
</span><span style="color:#323232;">  db:
</span><span style="color:#323232;">    image: mariadb
</span><span style="color:#323232;">    restart: always
</span><span style="color:#323232;">    command: --transaction-isolation=READ-COMMITTED --log-bin=binlog --binlog-format=ROW
</span><span style="color:#323232;">    volumes:
</span><span style="color:#323232;">      - ./mysql:/var/lib/mysql
</span><span style="color:#323232;">    environment:
</span><span style="color:#323232;">      - MYSQL_PASSWORD=supersecretpassword
</span><span style="color:#323232;">      - MYSQL_DATABASE=nextclouddb
</span><span style="color:#323232;">      - MYSQL_USER=nextclouduser
</span><span style="color:#323232;">      - MYSQL_RANDOM_ROOT_PASSWORD='yes'
</span><span style="color:#323232;">
</span><span style="color:#323232;">  redis:
</span><span style="color:#323232;">
</span><span style="color:#323232;">    image: redis
</span><span style="color:#323232;">
</span><span style="color:#323232;">    restart: always
</span><span style="color:#323232;">
</span><span style="color:#323232;">    command: redis-server --requirepass supersecretpassword2
</span><span style="color:#323232;">
</span><span style="color:#323232;">  app:
</span><span style="color:#323232;">    image: nextcloud:27
</span><span style="color:#323232;">    restart: always
</span><span style="color:#323232;">    ports:
</span><span style="color:#323232;">      - 8080:80
</span><span style="color:#323232;">    links:
</span><span style="color:#323232;">      - db
</span><span style="color:#323232;">      - redis
</span><span style="color:#323232;">    volumes:
</span><span style="color:#323232;">      - ./html:/var/www/html
</span><span style="color:#323232;">    environment:
</span><span style="color:#323232;">      - MYSQL_PASSWORD=supersecretpassword
</span><span style="color:#323232;">      - MYSQL_DATABASE=nextclouddb
</span><span style="color:#323232;">      - MYSQL_USER=nextclouduser
</span><span style="color:#323232;">      - MYSQL_HOST=db
</span><span style="color:#323232;">      - REDIS_HOST_PASSWORD=supersecretpassword2
</span><span style="color:#323232;">    depends_on:
</span><span style="color:#323232;">      - db
</span><span style="color:#323232;">      - redis
</span><span style="color:#323232;">  cron:
</span><span style="color:#323232;">    image: nextcloud:27
</span><span style="color:#323232;">    restart: always
</span><span style="color:#323232;">    volumes:
</span><span style="color:#323232;">      - ./html:/var/www/html
</span><span style="color:#323232;">    entrypoint: /cron.sh
</span><span style="color:#323232;">    depends_on:
</span><span style="color:#323232;">      - db
</span>

To use this you need docker-compose installed. Once thats installed create a nextcloud folder and copy in this file as docker-compose.yaml. Once you are in the working directory run docker-compose up -d