Merge branch 'master' of https://git.mylab.th-luebeck.de/cloud-native/lab-containerization

.gitlab-ci.yml

+services:
+- docker:dind
+
 stages:
-    - test
-    - build
+- test
+- build
 
-test:
+build-local-to-test:
     stage: test
-    image: docker:19.03.12
     script:
     - docker build -t web:test .
-    - docker run -d -p 80:80 web:test
-    - curl http://localhost
+    - docker run -d -p 8888:80 web:test
+    - sleep 5
+    - wget http://docker:8888 --output-document fetched.html
+    - cmp fetched.html web/index.html || echo "Wrong HTML document"
 
-build:
+build-to-publish:
     stage: build
-    services:
-    - docker:dind
     script:
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-    - docker build -t $CI_REGISTRY_IMAGE/web:$CI_COMMIT_SHA -t $CI_REGISTRY_IMAGE/web:latest .
-    - docker push $CI_REGISTRY_IMAGE/web:$CI_COMMIT_SHA
+    - docker build -t $CI_REGISTRY_IMAGE/web:automatic -t $CI_REGISTRY_IMAGE/web:latest .
+    - docker push $CI_REGISTRY_IMAGE/web:automatic
     - docker push $CI_REGISTRY_IMAGE/web:latest