Add checkout step to doc deploy job

[Andy-Grigg]

Fix release doc publish failure by adding checkout step to workflow.

I don't think we actually need to checkout this repo, but this is a convenient way of making sure git is setup and authenticated correctly.

Once this is merged I will cherrypick to the release/1.5 branch and try another rc

[da1910]

Seems reasonable, if a bit weird to need to do it even when we don't actually need the code

[Andy-Grigg]

Seems reasonable, if a bit weird to need to do it even when we don't actually need the code

If we move to using the PyAnsys publish doc actions we can simplify things again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (7f50fb0) to head (8891312).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #504   +/-   ##
=======================================
  Coverage   94.35%   94.35%           
=======================================
  Files           7        7           
  Lines         780      780           
=======================================
  Hits          736      736           
  Misses         44       44           

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