Split out CI and CD Process?

[justinharringa]

Currently, the whole CI/CD flow is managed by .github/workflows/cd.yml which is good for reuse of the 2 steps that we use in both the PR process but also in the process for release. The minor downside to this is that a PR's checks will never fold into a nice, clean green box. Instead, they look like this:

Since build-test and integration-test are essentially managed by Makefile and the only copy/pasta we'd need to manage would be the Actions code itself, it doesn't seem unreasonable to split this into 2 workflow files. But I'd like others to weigh in.

Thoughts @afalko, @npwolf, and others?