Adding missing var and updating trigger for testing

[cthulhuplus]

Resolves # 4070 #4070

Description

Adds missing var to preview AMI builds

Significant changes or possible side effects

It's a change to CircleCI config file, so potential to impact builds. It is a part of the weekly ami build, so it could impact that as well.

Automated test cases written

None

Steps to manually verify this change

1. Ran the change as "on push" and it successfully built a new Preview AMI

This pull request is ready to review when

• Automated tests are updated (and all tests are passing)
• Pull request has been labeled, if applicable with feature, content, bug, tests, refactor
• Associated OpenAPI documentation has been updated
• The experience passes a basic manual accessibility audit (keyboard nav, screenreader, text scaling) OR an exemption is documented

This pull request can be merged when

• Code has been reviewed by someone other than the original author
• QA has verified the accessibility and functionality related to the change
• Design has approved the experience
• Product has approved the experience

[cms-eapd-bot]

This deploy was cleaned up.

[codecov-commenter]

Codecov Report

Merging #4070 (d689086) into main (7d10733) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4070   +/-   ##
=======================================
  Coverage   85.36%   85.36%           
=======================================
  Files         321      321           
  Lines        6483     6483           
  Branches     1250     1250           
=======================================
  Hits         5534     5534           
  Misses        881      881           
  Partials       68       68           

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[tbolt]

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