[gitlab] fix incorrect var

[celenechang]

What does this PR do?

Fix envvar missed in #1321

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.36%. Comparing base (6151d9c) to head (6573b2e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1326   +/-   ##
=======================================
  Coverage   47.36%   47.36%           
=======================================
  Files         230      230           
  Lines       22027    22027           
=======================================
  Hits        10432    10432           
  Misses      11005    11005           
  Partials      590      590           

Flag	Coverage Δ
unittests	47.36% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6151d9c...6573b2e. Read the comment docs.