revert changes. breaks chromium build

.gitlab-ci.yml

 stages:
   - build
+  - test
+  - push
+
+before_script:
+  - docker info
 
 build_image:
   tags:
-   - docker
+   - shell
   stage: build
-  image:
-    name: gcr.io/kaniko-project/executor:debug
-    entrypoint: [""]
   script:
-    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
-    - rm /kaniko/.docker/config.json
+    - docker build --no-cache -t registry.cybbh.space/courseware-as-code/courseware-builder/container .
+  only:
+    - master
+
+test_image:
+  tags:
+   - shell
+  stage: test
+  script:
+    - docker run registry.cybbh.space/courseware-as-code/courseware-builder/container /opt/course_builder/tests.sh
   only:
     - master
+
+push_image:
+  tags:
+   - shell
+  stage: push
+  script:
+    - docker login -u "${DOCKER_LOGIN_USER}" -p "${DOCKER_LOGIN_PASS}" registry.cybbh.space
+    - docker push registry.cybbh.space/courseware-as-code/courseware-builder/container
+    - rm ~/.docker/config.json
+  only:
+    - master
+