That's an excellent example of what I like to call "good IT hygiene". I too would like to know what kind of tools you have to perform the functional and integration tests, and to execute the various rollouts.
Without going too deeply into details, we use common non-cloud-native platforms such as Jenkins to configure and schedule the tests. Unit tests are often baked into Makefiles while functional / integration tests are usually written as shell scripts, python scripts, or (depending on what needs to happen) even Ansible playbooks. This allows us to avoid cloud vendor lock-in, while using the cloud to host this infra and the deployment envs themselves.
Edit: we use Makefiles, not because we are writing code in C (we are not) but because our tech culture is very familiar with using 'make' to orchestrate polyglot language builds and deployments.
Edit: we use Makefiles, not because we are writing code in C (we are not) but because our tech culture is very familiar with using 'make' to orchestrate polyglot language builds and deployments.