Add checkout token to support private repos

[szinn]

Flux-diff is not able to pull the repo if it is a private repo. Adding a token to the checkout action appears to resolve that issue.

[allenporter]

I may need to run the github workflow at an older version. Let me work on that to fix CI.

[szinn]

I wonder if this is a log in to gh?

[allenporter]

I'm not really understanding the action failures here. Are they a result of this change?

[allenporter]

Do the tests pass with the default value unset?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e76c0fe) 93.45% compared to head (a355fc7) 93.45%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   93.45%   93.45%           
=======================================
  Files          19       19           
  Lines        1972     1972           
=======================================
  Hits         1843     1843           
  Misses        129      129           

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[tyriis]

@szinn @allenporter, what needs to be done to fix this? (when setting the default to '') it works for me, I have opened a pr, but looks like there is an issue with the test setup.

[yalait]

Right here fix problems
szinn#2

[allenporter]

I resolved the merge conflict and re-ran the tests and things look good.