build(cmake): add prep/init.cmake

[ReenigneArcher]

Description

Replacement for #2373

Screenshot

Issues Fixed or Closed

• Closes build(linux): Set default SUNSHINE_EXECUTABLE_PATH earlier so it works #2373

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.50%. Comparing base (1ed22ab) to head (2de29db).

Additional details and impacted files

@@            Coverage Diff             @@
##           nightly   #2375      +/-   ##
==========================================
+ Coverage     6.36%   6.50%   +0.14%     
==========================================
  Files           85      85              
  Lines        18378   18382       +4     
  Branches      8342    8348       +6     
==========================================
+ Hits          1169    1196      +27     
+ Misses       16197   16103      -94     
- Partials      1012    1083      +71     

Flag	Coverage Δ
Linux	4.42% <ø> (ø)
Windows	2.00% <ø> (ø)
macOS-12	8.73% <ø> (?)
macOS-13	8.07% <ø> (?)
macOS-14	8.39% <ø> (ø)

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see 18 files with indirect coverage changes