Add missing env variable for test

[felddy]

🗣 Description

I forgot to add pass the RELEASE_TAG environment variable.

This is the same as cisagov/skeleton-python-library#26

💭 Motivation and Context

This is needed to verify the release tag matches the version in the codebase.

🧪 Testing

📷 Screenshots (if appropriate)

🚥 Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (causes existing functionality to change)

✅ Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[dav3r]

🔬

[jsf9k]

This is dynamite!