Adding test build. Adding scheduled build_and_push for master.

.gitlab-ci.yml

@@ -2,13 +2,20 @@ image: docker:latest
 services:
     - docker:dind
 
-variables:
-    CONTAINER_TAG: registry.hzdr.de/pape58/slurm-in-docker:fedora-31
+test_build:
+    stage: test
+    tags:
+        - dind
+    before_script:
+        - apk add make
+    script:
+        - make build
 
 build_and_push:
     stage: deploy
     only:
         - master
+        - schedules
     tags:
         - dind
     before_script: