Here is the write up for Basics Loki CTF SecureBug 2020 to increase your Web Security skills
Executing the command below let the Docker runs on port number 1337:
docker-compose -f docker-compose.prod.yml up -d
Then it stops here:
docker-compose down -v
By reversing the process of each 30 mentioned function, finding 30 decimals, changing to ascii numbers and putting them together we get the flag.