Update .gitlab-ci.yml

.gitlab-ci.yml

 image: ubuntu
 
-build-job:
-  stage: build
-  script:
-    - echo "Hello, $GITLAB_USER_LOGIN!"
-
-test-job1:
-  stage: test
-  script:
-    - echo "this job tests fork1"
-
-test-job2:
-  stage: test
-  script:
-    - echo "this job tests fork2"
-
-deploy-prod:
-  stage: deploy
-  script:
-    - echo "this job tests fork3"
+before_script:
+  - echo "Hello, $GITLAB_USER_LOGIN!"
+  - 'which ssh-agent || ( apt-get update -y && apt-get install openssh-client -y )'
+  - eval $(ssh-agent -s)
+  - echo "$SSH_PRIVATE_KEY" | base64 -d | tr -d '\r' | ssh-add - > /dev/null
+  - mkdir -p ~/.ssh
+  - chmod 700 ~/.ssh
+  - ssh-keyscan bwunicluster.scc.kit.edu > ~/.ssh/known_hosts
+  - chmod 644 ~/.ssh/known_hosts
+
+Test SSH:
+    script:
+      - ssh $USER_NAME "./scriptPull/pull.sh"