Have fun with your friends, every once in a while!
Setup credentials in .env, you need the usual AWS:
AWS_ACCESS_KEY_IDAWS_SECRET_ACCESS_KEYAWS_DEFAULT_REGION
#############################
# Put a password in config
# for example, generate one with:
docker-compose run --rm backups ash
pass=$(strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 30 | tr -d '\n')
echo "RCON_PASSWORD=$pass" >> .env
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# Run
docker-compose up -d
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# Restore backup, if it exists
docker-compose run --rm backups boot restore