Add cross-platform CI/CD build workflow (Linux, macOS, Windows)

[Copilot]

The project had no CI and the Inno Setup script had a hardcoded developer machine path, making automated and cross-platform builds impossible.

Changes

• .github/workflows/build.yml — New workflow triggering on every push and PR across all branches. Matrix builds on windows, linux, and macos:

  • All runners: .NET 8 restore → dotnet publish -r win-x64 --self-contained false → upload binary artifact named LegacyConsolePackEditor-{windows|linux|macos}
  • Windows only: additionally runs Inno Setup and uploads LegacyConsolePackEditor-Installer

• LegacyConsolePackEditor.csproj — Added <EnableWindowsTargeting>true</EnableWindowsTargeting>, required for the .NET SDK to cross-compile net8.0-windows/WinForms targets on non-Windows hosts.

• LegacyConsolePackEditorInstaller.iss — Replaced hardcoded C:\Users\eolia\... with an overridable default; CI passes the path via command-line flag:

  #ifndef MySourceDir
    #define MySourceDir "bin\Release\net8.0-windows\win-x64\publish"
  #endif
  

  CI invocation: iscc /DMySourceDir=publish LegacyConsolePackEditorInstaller.iss

Original prompt

Yo! Can you make this buildable for Linux and if possible MacOS...
And also make it auto build when I push, feel free to use the .iss setup script for help.

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