[DRAFT] CI for Cygwin

[justsmth]

Issues:

Resolves #ISSUE-NUMBER1
Addresses #ISSUE-NUMBER2

Description of changes:

Describe AWS-LC’s current behavior and how your code changes that behavior. If there are no issues this pr is resolving, explain why this change is necessary.

Call-outs:

Point out areas that need special attention or support during the review process. Discuss architecture or design changes.

Testing:

How is this change tested (unit tests, fuzz tests, etc.)? Are there any testing steps to be verified by the reviewer?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.68%. Comparing base (4d69053) to head (e8f0082).
⚠️ Report is 447 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2544      +/-   ##
==========================================
- Coverage   78.69%   78.68%   -0.02%     
==========================================
  Files         644      644              
  Lines      110481   110480       -1     
  Branches    15640    15639       -1     
==========================================
- Hits        86945    86933      -12     
- Misses      22837    22846       +9     
- Partials      699      701       +2     

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