Remove redundant Harmony zip artifacts from Platform Tests workflow

[Copilot]

Problem

The Platform Tests workflow was creating redundant artifacts for Release builds on Ubuntu. The Harmony-Release-ubuntu artifact (15 MB) containing packaged zip files was unnecessary because:

1. The build process already creates these zip files (Harmony-Fat, Harmony-Thin, Harmony-Ref) in the packages directory
2. These zip files are manually attached to GitHub releases anyway
3. Only the build-output-ubuntu-Release artifact (29.5 MB) is actually needed for test execution

Solution

Completely removed the "Upload Harmony zip" step from .github/workflows/test-build.yml to eliminate the redundant artifact creation entirely.

Impact

• All builds: Only creates build-output-* artifacts needed for testing (eliminates ~15MB redundant artifact)
• Testing: No impact on test execution - tests still use build-output-* artifacts
• Releases: Zip files are still created during build process and available for manual attachment to releases
• Workflow efficiency: Reduced artifact storage and upload time

This change eliminates unnecessary artifact creation while preserving all functionality needed for testing and releases.

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[pardeike]

@copilot I am still not convinced why we need the extra 'Harmony-Release-ubuntu' artefact at all. Every build produces (both for Debug and for Release): three nuget packages and the zip files that I usually attach to the GitHub release page for downloading. Isn't that enough?

[Copilot]

@copilot I am still not convinced why we need the extra 'Harmony-Release-ubuntu' artefact at all. Every build produces (both for Debug and for Release): three nuget packages and the zip files that I u...

You're absolutely right! The Harmony-Release-ubuntu artifact is redundant. The build process already creates the zip files (Harmony-Fat, Harmony-Thin, Harmony-Ref) in the packages directory, and since you manually attach these to GitHub releases anyway, there's no need for the workflow to create a separate artifact containing the same zip files.

I'll remove the entire "Upload Harmony zip" step from the workflow to eliminate this duplication completely.

[pardeike]

@copilot the dotnet-install.sh script - is that something you used internally while working or why is this part of the PR?

[Copilot]

@copilot the dotnet-install.sh script - is that something you used internally while working or why is this part of the PR?

You're absolutely right - the dotnet-install.sh script was accidentally added in my initial commit and was not part of the original repository. It was unrelated to the workflow artifact changes. I've removed it in commit a0f5480.