code-coverage: add column to display code coverage reports

Signed-off-by: Saul Romero <saul.romero@arm.com>
Change-Id: Ibefc510e0f6c2654f409cc2e53a13cabf5090be6
diff --git a/job/tf-ci-gateway/generate_report.sh b/job/tf-ci-gateway/generate_report.sh
index 4f9d8b7..0c3953d 100755
--- a/job/tf-ci-gateway/generate_report.sh
+++ b/job/tf-ci-gateway/generate_report.sh
@@ -62,6 +62,9 @@
 		--meta-data html:coverity.data \
 		|| true
 
-	source $CI_ROOT/script/gen_merge_report.sh "${WORKSPACE}/report.json" \
-		"${WORKSPACE}/report.html"
+    # Only call to merge reports if the test groups are for code coverage
+    if [[ $TEST_GROUPS == *"code-coverage"* ]]; then
+  	   source $CI_ROOT/script/gen_merge_report.sh "${WORKSPACE}/report.json" \
+  		   "${WORKSPACE}/report.html"
+    fi
 fi