Assign Copilot to issues created by scheduled test failure job

[Copilot]

The create-issue-on-failure job creates GitHub issues when the monthly scheduled CI run fails, but issues were not assigned to anyone for follow-up.

Changes

• .github/workflows/tests.yml: Added assignees: ['Copilot'] to the github.rest.issues.create call so newly created failure issues are automatically assigned to GitHub Copilot.

await github.rest.issues.create({
  owner: context.repo.owner,
  repo: context.repo.repo,
  title: title,
  body: body,
  labels: ['automated-test-failure'],
  assignees: ['Copilot']   // ← added
});

Note: existing-issue comments (when a failure issue is already open) are unaffected — only new issue creation gains the assignee.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[github-actions]

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