Cypress env variable is case sensitive

templates/docker-compose.yml.twig

@@ -530,7 +530,7 @@ services:
     environment:
       - CYPRESS_baseUrl={{ projectprotocol }}://{{ projectdomain }}{{ projectport }}
 {% if mailhog.enable %}
-      - CYPRESS_mailhogUrl={{ projectprotocol }}://mailhog-{{ projectdomain }}{{ projectport }}
+      - CYPRESS_MAILHOGURL={{ projectprotocol }}://mailhog-{{ projectdomain }}{{ projectport }}
 {% endif %}
       - PHP_CONTAINER={{ projectname }}-php-1
 {% if not drupal.live|default(0) %}