Merge branch 'daily_docker_builds' into 'NIFTy_4'

Add Docker builds without caching. Needs to be activated in Gitlab

See merge request ift/NIFTy!253

.gitlab-ci.yml

@@ -8,7 +8,19 @@ stages:
   - test
   - release
 
-build_docker:
+build_docker_from_scratch:
+  only:
+    - schedules
+  image: docker:stable
+  stage: build_docker
+  script:
+    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN gitlab-registry.mpcdf.mpg.de
+    - docker build -t $CONTAINER_TEST_IMAGE --no-cache .
+    - docker push $CONTAINER_TEST_IMAGE
+
+build_docker_from_cache:
+  except:
+    - schedules
   image: docker:stable
   stage: build_docker
   script: