Refactor PR checks to run jobs in parallel

[ScottBrenner]

Leverages https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#jobsjob_idstepsparallel, reference https://github.blog/changelog/2026-06-25-actions-steps-can-now-be-run-in-parallel/.

Example run - https://github.com/noahm/DDRCardDraw/actions/runs/28329029313/job/83923899033

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Project	Deployment	Actions	Updated (UTC)
ddr-tools	Ready	Preview	Jun 28, 2026 4:44pm

[noahm]

This is a neat new feature to learn about! However, are you aware of any benefits it has over the matrix approach the actions here are already configured with? I see one downside to it which is that all the individual checks now roll up into a single status item, rather than showing as distinct checks on the PR status.

[ScottBrenner]

Matrices are intended to be for multiple job runs from a single definition, across a combination of variables - which just so happened to be usable for the checks that are run here. Parallel does run a group of checks in a single job, as you've noted. I wouldn't say it's any better necessarily, just a more ""native"" way of doing these checks at the same time.