Add nextcloud-redis-mariadb sample

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

nextcloud-redis-mariadb/README.md

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+## Nextcloud with Redis and MariaDB
+This example defines one of the basic setups for Nextcloud. More details on how to
+further customize the installation and the compose file can be found on the
+[official image page](https://hub.docker.com/_/nextcloud).
+
+
+Project structure:
+```
+.
+├── docker-compose.yaml
+└── README.md
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services:
+  nc:
+    image: nextcloud:apache
+    ports:
+      - 80:80
+    ...
+  redis:
+    image: redis:alpine
+    restart: always
+    networks:
+      - redisnet
+  db:
+    image: mariadb
+    ...
+```
+
+When deploying this setup, docker-compose maps the nextcloud container port 80 to
+port 80 of the host as specified in the compose file.
+
+## Deploy with docker-compose
+
+```
+$ docker$ compose up -d
+Creating network "nextcloud-redis-mariadb_redisnet" with the default driver
+Creating network "nextcloud-redis-mariadb_dbnet" with the default driver
+Creating volume "nextcloud-redis-mariadb_nc_data" with default driver
+Pulling redis (redis:alpine)...
+alpine: Pulling from library/redis....
+....
+Status: Downloaded newer image for mariadb:latest
+Creating nextcloud-redis-mariadb_db_1    ... done
+Creating nextcloud-redis-mariadb_nc_1    ... done
+Creating nextcloud-redis-mariadb_redis_1 ... done
+```
+
+
+## Expected result
+
+Check containers are running and the port mapping:
+```
+$ docker ps
+CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
+6541add4d648        nextcloud:apache    "/entrypoint.sh apac…"   35 seconds ago      Up 34 seconds       0.0.0.0:80->80/tcp   nextcloud-redis-mariadb_nc_1
+6c656f98cf14        redis:alpine        "docker-entrypoint.s…"   35 seconds ago      Up 34 seconds       6379/tcp             nextcloud-redis-mariadb_redis_1
+6d4c6630a4a3        mariadb             "docker-entrypoint.s…"   35 seconds ago      Up 34 seconds       3306/tcp             nextcloud-redis-mariadb_db_1
+```
+
+Navigate to `http://localhost:80` in your web browser to access the installed
+Nextcloud service.
+
+![page](output.jpg)
+
+Stop and remove the containers
+
+```
+$ docker-compose down
+```
+
+To delete all data, remove all named volumes by passing the `-v` arguments:
+```
+$ docker-compose down -v
+```

nextcloud-redis-mariadb/docker-compose.yaml

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+version: '3.7'
+services:
+  nc:
+    image: nextcloud:apache
+    restart: always
+    ports:
+      - 80:80
+    volumes:
+      - nc_data:/var/www/html
+    networks:
+      - redisnet
+      - dbnet
+    environment:
+      - REDIS_HOST=redis
+      - MYSQL_HOST=db
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+      - MYSQL_PASSWORD=nextcloud
+  redis:
+    image: redis:alpine
+    restart: always
+    networks:
+      - redisnet
+  db:
+    image: mariadb
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
+    restart: always
+    volumes:
+      - db_data:/var/lib/mysql
+    networks:
+      - dbnet
+    environment:
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+      - MYSQL_ROOT_PASSWORD=nextcloud
+      - MYSQL_PASSWORD=nextcloud
+volumes:
+  db_data:
+  nc_data:
+networks:
+  dbnet:
+  redisnet:
+  
+  
+