Enable tests for PRs that don't merge into main or develop

[jwallwork23]

Closes #764

I have a PR (#763) that makes edits to a branch other than main or develop. To run the tests, I needed to modify the GitHub Actions workflow. Is this intended?

Closes #769

I recommend we use this approach described here i.e.,:

Workflows that would otherwise be triggered using on: push or on: pull_request won't be triggered if you add any of the following strings to the commit message in a push, or the HEAD commit of a pull request:

• [skip ci]
• [ci skip]
• [no ci]
• [skip actions]
• [actions skip]

I think we should avoid editing .github/workflows/test_suite.yml.

There is another popular approach using something like if: github.event.pull_request.draft == false in the workflow, but this comes with many problems. See here for more info.

[jwallwork23]

@TomMelt to look into draft PRs. If not, add a comment here for how to ignore certain branches.

[AdelekeBankole]

@TomMelt, thank you. This looks good to me at least from what I picked up from yesterday's meeting.

[TomMelt]

@timspainNERSC , I just raised #769 because I realised I could merge without the tests running at all. We should be able to fix this next meeting.