First, we need a script that setup admin account for us after starting the service. init.sh file that you should put inside ntfy/init.sh

#!/bin/sh
ntfy serve &
sleep 2
NTFY_PASSWORD=${NTFY_PASSWORD} ntfy user add --role=admin ${NTFY_USER}
wait

Now the compose file compose.yaml or docker-compose.yaml file.

services:
  ntfy:
    image: binwiederhier/ntfy
    container_name: ntfy
    entrypoint: [ "/bin/sh", "/var/lib/ntfy/init.sh" ]
    environment:
      - TZ=UTC    # optional: set desired timezone
      - NTFY_BASE_URL=https://ntfy.dilawars.me
      - NTFY_AUTH_FILE=/var/lib/ntfy/auth.db
      - NTFY_CACHE_FILE=/var/lib/ntfy/cache.db
      - NTFY_AUTH_DEFAULT_ACCESS=deny-all
      - NTFY_ATTACHMENT_CACHE_DIR=/var/lib/ntfy/attachments
      - NTFY_ENABLE_LOGIN=true
      - NTFY_USER=admin
      - NTFY_PASSWORD=yoyodillusingh
    volumes:
      - /var/cache/ntfy:/var/cache/ntfy
      - /etc/ntfy:/etc/ntfy
      - ./ntfy/:/var/lib/ntfy
    ports:
      - 8001:80
    healthcheck: # optional: remember to adapt the host:port to your environment
        test: ["CMD-SHELL", "wget -q --tries=1 <http://localhost:80/v1/health> -O - | grep -Eo '\\"healthy\\"\\\\s*:\\\\s*true' || exit 1"]
        interval: 60s
        timeout: 10s
        retries: 3
        start_period: 40s
    restart: unless-stopped