Add Alpine-Linux-x86 to GitHub Actions CI

[kexgaber]

Issues:

CryptoAlg-621
CryptoAlg-2262

Description of changes:

This adds a new job to the General CI GitHub Actions workflow to build and test AWS-LC on Alpine Linux (x86_64 architecture), using both Clang and GCC compilers. This ensures AWS-LC remains compatible with musl-based systems, such as Alpine.

Call-outs:

• When ARM-powered runners are made generally available, this job can be expanded to also target the arm64 architecture.

Testing:

This new job runs the existing tests found in tests/ci/run_posix_tests.sh and tests/ci/run_fips_tests.sh

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 78.48%. Comparing base (bda01b4) to head (13056d9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1753      +/-   ##
==========================================
- Coverage   78.49%   78.48%   -0.01%     
==========================================
  Files         585      585              
  Lines       99630    99630              
  Branches    14253    14254       +1     
==========================================
- Hits        78201    78199       -2     
- Misses      20794    20796       +2     
  Partials      635      635              

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[chipitsine]

I'd suggest to use more native way like this one

https://github.com/haproxy/haproxy/blob/master/.github/workflows/musl.yml#L13-L14