This looks nice! Wish they had a no-credit-card-required version for educational purposes. For the course I teach we use Spring Boot, and life was good with Heroku till they discontinued the no-credit-card version, and then the only choice we had (with support for Spring Boot) was to move over to Azure, which works but is a bit overkill and complicated for our purposes. I guess we could just use Docker and then many more platform would become available, but I'd rather not add one more step to the pipeline if possible.