Fix environment variable persistence in Copilot setup workflow

[johlju]

Pull Request (PR) description

This Pull Request (PR) fixes the following issues

Task list

• Added an entry to the change log under the Unreleased section of the
  file CHANGELOG.md. Entry should say what was changed and how that
  affects users (if applicable), and reference the issue being resolved
  (if applicable).
• Resource documentation updated in the resource's README.md.
• Resource parameter descriptions updated in schema.mof.
• Comment-based help updated, including parameter descriptions.
• Localization strings updated.
• Examples updated.
• Unit tests updated. See DSC Community Testing Guidelines.
• Integration tests updated (where possible). See DSC Community Testing Guidelines.
• Code changes adheres to DSC Community Style Guidelines.

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This change is 

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📥 Commits

Reviewing files that changed from the base of the PR and between aa0987d and 5d23ff0.

📒 Files selected for processing (2)

• .github/workflows/copilot-setup-steps.yml (1 hunks)
• CHANGELOG.md (1 hunks)

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