Added air workflow scripts

[rmbielby]

Brief overview of changes

Adding reusable and example script for triggering an Air workflow.

Why are these changes being made?

To help analysts style their dashboard code quickly

Detailed description of changes

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Additional information for reviewers

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Issue ticket number/s and link

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.30%. Comparing base (e402994) to head (0ac9e41).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #116   +/-   ##
=======================================
  Coverage   66.30%   66.30%           
=======================================
  Files          14       14           
  Lines        1279     1279           
=======================================
  Hits          848      848           
  Misses        431      431           

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[cjrace]

Think you're still working on it, though a quick comment while I'm here, is there any reason why we're triple naming the workflow? Could we just do it as air / air, or even just air?

[cjrace]

For this it's worth considering:

• how much we may or may not want people to also be using the usethis::use_air() function to set it all up
• if the positron / vscode default settings are worth pushing for project-level settings (I set them up in shinyGovstyle here (only look at the first 2 commits before all the formatting changes) - 124 tidy up inbetween milestones shinyGovstyle#161)