You must provide the token to your discord bot in the .env file first.
Navigate to the .env.example file. Rename this file to .env.
Provide your token after the DISCORD_TOKEN=
As an example
DISCORD_TOKEN=1234567890
This is a good guide on how to get your token from the Discord Developer Portal: https://discordgsm.com/guide/how-to-get-a-discord-bot-token
Run ./tools/build_docker.sh to build the docker container.
Run ./tools/run_docker.sh to run the docker container and bot.
If you want to run this bot in the background of a server, I recommend using screen or tmux.