ci: enable Vagrant-based testing using GitHub Actions

[myii]

PR progress checklist (to be filled in by reviewers)

• Changes to documentation are appropriate (or tick if not required)
• Changes to tests are appropriate (or tick if not required)
• Reviews completed

---

What type of PR is this?

Primary type

• [build] Changes related to the build system
• [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [ci] Changes to the continuous integration configuration
• [feat] A new feature
• [fix] A bug fix
• [perf] A code change that improves performance
• [refactor] A code change that neither fixes a bug nor adds a feature
• [revert] A change used to revert a previous commit
• [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [docs] Documentation changes
• [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

• Semi-automated using feat(vagrant+proxy): add testing via. GitHub Actions myii/ssf-formula#304

Describe the changes you're proposing

Explaining commit-by-commit:

ci: enable Vagrant-based testing using GitHub Actions

• As explained at the URL mentioned above.

docs(readme): add Testing with Vagrant section

• Explain how to run these Vagrant-based tests locally.

fix(osfamilymap): use whoami for Windows rootuser

• Fix bug [BUG] salt['cmd.run']("id -un") failed on Windows 10 #495.

test: add Windows map verification files

• Add map.jinja verification files for all Windows platforms.

test(_mapdata): add Arch Linux verification file

• Add map.jinja verification files for Arch Linux.

refactor(retry_options): provide options from defaults/pillar

• Centralise retry_options as done in many other formulas.

fix(freebsd): update to provide support for most recent versions

• Add the new data in osmap.yaml.
• Make adjustments to ensure all instances pass in the CI.
• Add map.jinja verification files for FreeBSD.

fix(openbsd): update to provide support for most recent versions

• Add the new data in osmap.yaml.
• Add map.jinja verification files for OpenBSD.

test: update for new platforms (inc. using system library)

• Update all tests to include the new platforms.
• Use the system library throughout.

Pillar / config required to test the proposed changes

As-is.

Debug log showing how the proposed changes work

As shown in the CI.

Documentation checklist

• Updated the README (e.g. Available states).
• Updated pillar.example.

Testing checklist

• Included in Kitchen (i.e. under state_top).
• Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• Updated the relevant test pillar.

Additional context

[baby-gnu]

Maybe homogenize the use of system.platform over platform?

[myii]

Self-merge since mostly CI, tests and docs. Other minor changes don't affect other platforms other than the new ones introduced here.

Thanks for the review, @baby-gnu!

[saltstack-formulas-travis]

🎉 This PR is included in version 1.8.1 🎉

The release is available on GitHub release

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