ELI5 Setting Up Cron with docker-compose

I have Nextcloud running in a docker container on a Raspberry Pi and I get this message in Admin section.

Last background job execution ran 16 days ago. Something seems wrong. Check the background job settings

I set it to system cron but for the life of me I can’t check to see if it runs. When I bash into the container, cron nor system commands are found. I have read through tons of docs, GitHub issues and help topics and nothing makes sense. Other than this message, everything is working fine.

Here is the docker-compose yml

version: “3.7”
services:
nextcloud:
container_name: nextcloud
image: nextcloud:latest
restart: always
extra_hosts:
- “mariadb:192.168.250.250”
- “redis:192.168.50.10”
networks:
- traefik_proxy
- mariadb
ports:
- “4333:443”
security_opt:
- no-new-privileges:true
volumes:
- $CONFIGFOLDER/nc:/var/www/html/config
- $STORAGEFOLDER/nc-data:/var/www/html/data
- $DOCKERDIR/resolv.conf:/etc/resolv.conf
- $STORAGEFOLDER/photos:/ext-photo
- $CONFIGFOLDER/nc-apps:/var/www/html/custom_apps
environment:
- PUID=$PUID
- PGID=$PGID
- TZ=$TZ
- NEXTCLOUD_ADMIN_PASSWORD=$PASSWORD
- NEXTCLOUD_ADMIN_USER=isaac
- MYSQL_HOST=mariadb:3306
- MYSQL_DATABASE=nextcloud
- MYSQL_PASSWORD=$PASSWORD
- NEXTCLOUD_HOSTNAME=“nc.$DOMAINNAME”
- MYSQL_USER=root
- NEXTCLOUD_TRUSTED_DOMAINS=“nc.$DOMAINNAME”
- TRUSTED_PROXIES=192.168.50.0/24
- OVERWRITEPROTOCOL=https
- APACHE_DISABLE_REWRITE_IP=1
- REDIS_HOST=redis
- REDIS_HOST_PASSWORD=$PASSWORD
- START_CRON=true
labels:
- traefik.enable=true
- traefik.docker.network=traefik_proxy
- traefik.http.routers.nextcloud.middlewares=nextcloud,nextcloud_redirect
- traefik.http.routers.nextcloud.tls.certresolver=dns-cloudflare
- traefik.http.routers.nextcloud.rule=Host(nc.$DOMAINNAME)
- traefik.http.middlewares.nextcloud.headers.customFrameOptionsValue=ALLOW-FROM https://$DOMAINNAME
- traefik.http.middlewares.nextcloud.headers.contentSecurityPolicy=frame-ancestors ‘self’ $DOMAINNAME *.$DOMAINNAME
- traefik.http.middlewares.nextcloud.headers.stsSeconds=155520011
- traefik.http.middlewares.nextcloud.headers.stsIncludeSubdomains=true
- traefik.http.middlewares.nextcloud.headers.stsPreload=true
- traefik.http.middlewares.nextcloud_redirect.redirectregex.regex=/.well-known/(card|cal)dav
- traefik.http.middlewares.nextcloud_redirect.redirectregex.replacement=/remote.php/dav/

networks:
traefik_proxy:
external: true
mariadb:
external: true

Any help would be greatly appreciated