docs: update with new Linux workflow

[jonchang]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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Update the Linux documentation to describe its new, even more automated workflow.

[issyl0]

Looks good, thanks Jon! Here's to even less maintainer toil!

[issyl0]

Force-pushed to squash the GitHub UI commit and also re-wrap the lines.