Add workflows to test upload-artifact 500-file limit

[Copilot]

Tests the upload-artifact action's 500-file limitation across three scenarios: exceeding the limit, working around it with split uploads, and working around it with compression.

Workflows Added

• upload-artifact-test-single-upload.yml: Uploads 501 files in a single upload-artifact step to verify limit behavior
• upload-artifact-test-split-upload.yml: Splits 501 files across two upload-artifact steps (250 + 251 files) to demonstrate the workaround
• upload-artifact-test-zipped.yml: Zips 501 files into a single archive before upload, bypassing the per-file limit

All workflows are manually triggered via workflow_dispatch and use actions/upload-artifact@v4.

Implementation Details

Each workflow creates test files dynamically:

- name: Create 501 test files
  run: |
    mkdir -p test-files
    for i in {1..501}; do
      echo "This is test file number $i" > test-files/file-$i.txt
    done

The split upload workflow separates files into distinct directories to ensure accurate partitioning before uploading each set independently.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create multiple workflow files to test the upload limits of the actions/upload-artifact action</issue_title>
<issue_description>The Github actions Upload-artifact (https://github.com/actions/upload-artifact) has a limitation where you can only upload 500 files using it in a single job. https://github.com/actions/upload-artifact?tab=readme-ov-file#breaking-changes

I want to create some workflows to test this.

Workflow 1
This workflow should have a single job in it. It should have a step that creates 501 files, and then uses the upload-artifact action to load all 501 files to the workflow, to see what happens.

Workflow 2
This workflow should have a single job in it. It should have a step that creates 501 files, but this time it uses 2 upload-artifact action steps in the same job. The first one loads files 1-250, the second loads 251 - 501

Workflow 3
This workflow should have a single job in it. It should have a step that creates 501 files. it should then zip those files into a single zip file. And then use the upload-artifact action to load the zip file.

Only create these three worfklow files. Don't go creates any extra soruce code or anything, it should all happen in the workflows themselves.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create multiple workflow files to test the upload limits of the actions/upload-artifact action #43

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