GitHub Actions: Reduce duplication with action composition

Direct link so you can skip Twitter

https://github.blog/changelog/2021-08-25-github-actions-redu...

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This is a really minimal post that doesn't fully how this works or how to set it up. Rather confusing as is. Might as well skip the whole thing and go to the docs. https://docs.github.com/en/actions/creating-actions/creating...