CI/CD test and publish to NuGet

[ashtonmeuser]

Simple GitHub Action workflow to run tests and publish to NuGet. @nuskey8 This will require an API key stored as a secret. Runs on pushing a semver tag e.g. v0.5.4 or via explicit workflow dispatch.

This PR also throws the ExpectedFailure onto several of the test files inherited from Lua proper so we can skip them during CI. Note that additional test cases would require ExpectedFailure unless #279 is merged.

[ashtonmeuser]

This still requires updating Directory.Build.props with the correct version number. A nice-to-have improvement may be validating this version against the pushed tag.

Edit: I actually found that the versions had diverged already. See Directory.Build.props (0.5.3) and src/Lua.Unity/Assets/package.json (0.5.1). Added the version check.

[ashtonmeuser]

Any thoughts or concerns about this, @nuskey8 @akeit0?

[Copilot]

Pull request overview

Adds a GitHub Actions workflow to run the test suite and (on semver tag pushes) publish the NuGet package, while marking a couple of inherited Lua test files as expected failures so CI can skip them.

Changes:

• Introduces .github/workflows/nuget.yml to restore, test (excluding ExpectedFailure), pack, and publish on v*.*.* tags (or manual dispatch).
• Marks tests-lua/files.lua and tests-lua/errors.lua test cases as ExpectedFailure so they can be filtered out in CI.
• Ignores build output under artifacts/ in .gitignore.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/Lua.Tests/LuaTests.cs	Categorizes two Lua test cases as ExpectedFailure for CI filtering.
.gitignore	Adds artifacts/ to ignored paths.
.github/workflows/nuget.yml	New workflow for version validation, tests, packing, artifact upload, and NuGet publish.

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