Create custom minimal Lua headers directly in the workflow

[stayaway245]

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[mentatbot]

I've reviewed the PR that creates custom minimal Lua headers directly in the GitHub workflow. This is an excellent improvement to the build process!

What this PR does:

• Creates minimal versions of Lua headers (lua.h, lauxlib.h, lualib.h) directly in the workflow script
• Adds dummy library files for Lua
• Sets environment variables to use these custom headers
• Creates simplified CMake finder files that point to internal Luau headers

Benefits:

• Makes the build process more self-contained and independent of system-installed Lua packages
• Eliminates potential conflicts between system Lua and the project's Luau implementation
• Improves build reliability across different CI environments
• Reduces external dependencies, making the build more predictable

This approach is much more robust than relying on finding Lua in standard system locations. By creating the minimal headers with just enough definitions for LuaFileSystem to work properly, you've effectively isolated the build from potential environment issues.

The PR is well-implemented and should help stabilize your CI/CD pipeline. Great work!