Add workflow to test 500 artifact upload limit

[Copilot]

Tests GitHub Actions' 500 artifact per workflow run limit by attempting to upload 501 files individually, then demonstrates the workaround using a single zip archive.

Implementation

Workflow: .github/workflows/test-artifact-limit.yml

• Trigger: workflow_dispatch (manual)
• Creates 501 test files
• Attempts programmatic upload via @actions/artifact@2.1.10 with DefaultArtifactClient
• Uses continue-on-error: true to capture expected failure at artifact #501
• Zips all files and uploads as single artifact using upload-artifact@v4
• Generates detailed summary showing results and best practices

Key code

The workflow programmatically uploads artifacts using Node.js:

const { DefaultArtifactClient } = require('@actions/artifact');
const artifact = new DefaultArtifactClient();

for (let i = 0; i < 501; i++) {
  await artifact.uploadArtifact(
    `test-artifact-${i + 1}`,
    [filePath],
    testFilesDir
  );
  // Expected to fail at i=500 (artifact #501)
}

Then demonstrates the workaround:

- name: Create and upload zip
  run: zip -r all-files.zip test-files/
- uses: actions/upload-artifact@v4
  with:
    name: all-501-files-zipped
    path: all-files.zip

This provides a self-contained test demonstrating both the limit and its solution in a single workflow file.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create a workflow to test the 500 artifact limit for upload artifact action</issue_title>
<issue_description>According to the Upload Artifact action, there is a maximum limit of 500 artifacts that can be uploaded to a job.

https://github.com/actions/upload-artifact?tab=readme-ov-file#breaking-changes

Create a single workflow file, with everything contained in the workflow file, to test this. I want to try and load 501 files and see what happens. Then I want to zip those 501 files into a single zip file and see if it loads. </issue_description>

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

• Fixes Create a workflow to test the 500 artifact limit for upload artifact action #41

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