Addition of generic workflows from ACCESS-NRI/reproducibility

[CodeGat]

In this PR:

• Add config-generate-checksums.yml, config-pr-checks.yml from Removal of CI/CD Reusable Infrastructure reproducibility#29

References #23

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 14.44%. Comparing base (213dd71) to head (9d3c1b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   14.36%   14.44%   +0.07%     
==========================================
  Files          11       11              
  Lines         550      547       -3     
==========================================
  Hits           79       79              
+ Misses        471      468       -3     

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[jo-basevi]

Looks good to me. Is the documentation on these workflows (that was in reproducibility README) being added in subsequent PR's?

[CodeGat]

I'll be taking inspiration from them, yes. I'm not certain of their final form as maybe certain parts of the reusable workflows can be more tightly integrated in the other workflows. See #24 for the final form of these things