Fix reference for secret key

.gitlab-ci.yml

@@ -5,7 +5,7 @@ stages:
 
 before_script:
 - git submodule update --init --recursive
-- echo email.key $EMAIL_KEY >> local.properties
+- echo email.key $PEPPER >> local.properties
 - export GRADLE_USER_HOME=$(pwd)/.gradle
 - chmod +x ./gradlew