I found that your .env file contains DATABASE_URL which will be used for makefile to do migration up (https://github.com/bantawa04/go-fiber-boilerplate/blob/016a2b45c06882aea0d1efb8123e0cecdac427e2/.env#L11) i believe that your migration up is failed because your database host is database in .env file which is not pointing to anywhere. to make your code works your need to update DATABASE_URL from

postgresql://${DB_USERNAME}:${DB_PASSWORD}@database:5432/${DB_NAME}?sslmode=${DB_SSL_MODE}

to

postgresql://${DB_USERNAME}:${DB_PASSWORD}@{DB_HOST}:5432/${DB_NAME}?sslmode=${DB_SSL_MODE}

DB_HOST can be anything like localhost, ip address or your database's host in other server.