Merge branch 'ci-revision' into 'RWTHmoodle_4.x'

Cleanup, pin dind versions

See merge request !63

.gitlab-ci.yml

-image: docker:19.03.1
-
 stages:
 - build
 - deploy
@@ -7,8 +5,6 @@ stages:
 
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
-  DOCKER_TLS_CERTDIR: "/certs"
-  DOCKER_HOST: tcp://docker:2376 # Use TLS https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#tls-enabled
 
 build:
   stage: build
@@ -38,17 +34,19 @@ tag-latest:
 
 test:
   stage: test
+  image: docker:24
   services:
-    - docker:dind
+  - docker:24.0.5-dind
+  variables:
+    DOCKER_TLS_CERTDIR: "/certs"
+    DOCKER_HOST: tcp://docker:2376 # Use TLS https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#tls-enabled
   script:
   - mkdir out
-  - chmod 777 out 
+  - chmod 777 out
   - docker run --name examscan --rm -v $(pwd):$(pwd) -w $(pwd) ${CI_REGISTRY_IMAGE}:${CI_COMMIT_REF_SLUG} watermark.py tests/assets/pdfs out
   artifacts:
     paths:
     - out/
-  rules:
-  - when: never
 
 pages:
   image:
@@ -93,4 +91,4 @@ test-docs:
   only:
   - branches
   except:
-  - master
+  - master
\ No newline at end of file