Bring the stack up with docker-compose:
docker-compose up -d
Execute setup script inside the Vault container:
docker exec -i vault sh < setup.sh
If it finished successfully you should get DB and AppRole credentials outputted. Copy the secret_id value from the output and replace the default value of APPROLE_SECRET_ID with copied value in docker-compose.yml. After that run docker-compose up -d again and application should be available in http://localhost:8000. If you want to insert some test data run setup.sh locally.