Draft: Gitlab ci image build

sync ci image build to fit the manual builds https://reseed-documentation.rd.ruhr-uni-bochum.de/system/deployment/2_image_building/

.gitlab-ci.yml

 default:
   before_script:
-    - docker infoimage: docker:stable
-
+    - docker info
+    
+image: docker:stable
 image: ruby:2.7.8-alpine
 
 stages: