Fix macOS consumer CI install permissions

[Copilot]

The consumer macos-latest job failed because CMake installed trx-cpp to unwritable /usr/local. The consumer build now uses a workspace-local install prefix.

• Local installation

  • Configure trx-cpp with ${GITHUB_WORKSPACE}/install as CMAKE_INSTALL_PREFIX.

• Consumer discovery

  • Point CMAKE_PREFIX_PATH at the same local prefix.

-DCMAKE_INSTALL_PREFIX="${GITHUB_WORKSPACE}/install"
-DCMAKE_PREFIX_PATH="${GITHUB_WORKSPACE}/install"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.66%. Comparing base (5cf07d1) to head (909dcf5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   88.66%   88.66%           
=======================================
  Files          15       15           
  Lines        7765     7765           
  Branches     1044     1044           
=======================================
  Hits         6885     6885           
  Misses        880      880           

Flag	Coverage Δ
linux	87.86% <ø> (ø)
macos	88.50% <ø> (ø)

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[arokem]

@frheault : why did you close this? It does fix the mac issue, and maybe with some more work could also fix the Windows issue?

[arokem]

OIC, looks like you are mitigating this in #49

[frheault]

@arokem I thought the copilot suggestion would be shown to me and then I could test it on my PR rather than a separate PR and I didn't like the idea of doing iterative PR, then merging with my PR and then realize it was not working so I closed it and transfert the solution.

(So this was more ''in case'' to avoid multiple PR if it did not work on first try)

[arokem]

Yes - no worries - this all makes sense and I think we are all good now!