ci(arch): factor out build script

[P403n1x87]

The architectures build and release workflow share the same build script. This has been factored out into a script to reduce duplication and improve maintenance.

[codecov]

Codecov Report

Base: 69.28% // Head: 68.60% // Decreases project coverage by -0.68% ⚠️

Coverage data is based on head (28172f3) compared to base (6c79ee9).
Patch has no changes to coverable lines.

❗ Current head 28172f3 differs from pull request most recent head a3fc8f2. Consider uploading reports for the commit a3fc8f2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #151      +/-   ##
==========================================
- Coverage   69.28%   68.60%   -0.69%     
==========================================
  Files          23       23              
  Lines        2338     2338              
  Branches      687      687              
==========================================
- Hits         1620     1604      -16     
- Misses        403      414      +11     
- Partials      315      320       +5     

Impacted Files	Coverage Δ
src/mem.h	71.42% <0.00%> (-14.29%)	⬇️
src/austin.c	66.16% <0.00%> (-1.50%)	⬇️
src/py_thread.c	73.67% <0.00%> (-1.43%)	⬇️
src/py_proc.c	62.38% <0.00%> (-0.69%)	⬇️
src/py_string.h	65.38% <0.00%> (ø)

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