It seems like this app had a hassle free install and I don't have any tips so far. Just stick to the plan.

docker-compose.yml

services:
  heimdall:
    image: ghcr.io/linuxserver/heimdall
    container_name: heimdall
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/Athens
    volumes:
      - ${PWD}/config:/config
    ports:
      - 10080:80
      - 10443:443
    restart: unless-stopped
  
version: "2.1"