The pipelines for Flockademic are somewhat complex, and since it's open source, you can take a look at them: [0]. It's building four interrelated Node projects at the same time, running tests, deploying the back-end projects, then building the front-end project linking it to the back-end one, then running some end-to-end tests and other checks on the deployed code. And it does that for every branch.

No manual checkpoints and different kinds of hosts or containers though.

[0] https://gitlab.com/Flockademic/Flockademic/pipelines