Installation & Varnish Test Failed

### - Summary of the issue
Installation and varnish test failed while module on Marketplace.

### - Information on your environment,
This environment is failing:

"php_version":"7.4","magento_platform":"M2","magento_edition":"ce","magento_version":"2.3.7-p3","tool":"varnish","vendor":"purplecommerce","extension":"giftcard","version":"1.0.2","platform":"m2","magento_cloud_docker":"1.3.2","status":"FAIL"

"exit_code": 1

### - Steps to reproduce
If you check submission ID: c5x5xonyb1 you'll be able to cross-check the error.

Start by reviewing submission ID c5x5xonyb1 and reproducing the reported installation and Varnish failure in the listed Magento 2.3.7-p3 environment. The payload names no files or tests; done means identifying the failure, making the submission pass, and validating the result against the reported environment.

Written by the indexing model from the issue text.