Revert "Disable shallow clone"

This reverts commit 3c2c6db591.

.gitlab-ci.yml

@@ -4,7 +4,6 @@ variables:
   COBERTURA_REPORT: '$CI_PROJECT_DIR/app/build/reports/cobertura.xml'
   JACOCO_CSV_LOCATION: '$CI_PROJECT_DIR/app/build/reports/jacoco/jacocoTestReport/jacocoTestReport.csv'
   JACOCO_XML_LOCATION: '$CI_PROJECT_DIR/app/build/reports/jacoco/jacocoTestReport/jacocoTestReport.xml'
-  GIT_DEPTH: "0"
 
 stages:
   - test