Move build stage to use correct java version

.gitlab-ci.yml

@@ -69,6 +69,11 @@ include:
   - template: Security/License-Management.gitlab-ci.yml # https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/gitlab/ci/templates/Security/License-Management.gitlab-ci.yml
   - template: Security/SAST.gitlab-ci.yml # https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml
 
+build:
+  image: gradle:jdk12
+  stage: build
+  script: ./graldew build
+
 test:
     image: gradle:jdk12
     stage: test