Setup workflow for publishing dev version

[kprosise]

Note that this is a draft/first-go at publishing both a dev version of the docs, and publishing via a GitHub workflow. This will likely require additional work. Workflow was kept simple and set to handle a single case—publish when a commit is merged to dev branch of the docs.

QA steps: Ran actionlint on the workflow file, which produced a couple warnings: possible globbing issue due to expression used for getting the fioctl version, and a possible side effect for one of the assignments.

This commit applies to issue FFTK-4532, "Add dev version" This commit applies to issue FFTK-4116, "…GitHub action for publishing"

PR Template and Checklist

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[kprosise]

closing, opened to main rather than dev… should see about changing the default if possible