reverted staging step

.gitlab-ci.yml

 stages:
   - build
-  - staging
   - deploy
 
-docker-build:
+docker-build-master:
   # Official docker image.
   image: docker:latest
   stage: build
@@ -73,25 +72,6 @@ docker-deploy-acceptance:
   only:
     - acceptance
 
-# deploy acceptance version on 'dop457.astron.nl'
-docker-staging-acceptance:
-  image: docker:latest
-  stage: staging
-  before_script:
-    - 'command -v ssh-agent >/dev/null || ( apt-get update -y && apt-get install openssh-client -y )'
-    - eval $(ssh-agent -s)
-    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
-    - mkdir -p ~/.ssh
-    - chmod 700 ~/.ssh
-    - ssh-keyscan dop457.astron.nl >> ~/.ssh/known_hosts
-    - chmod 644 ~/.ssh/known_hosts
-  script:
-    - ssh -o StrictHostKeyChecking=no vermaas@dop457.astron.nl "docker pull "$CI_REGISTRY_IMAGE""
-    - ssh -o StrictHostKeyChecking=no vermaas@dop457.astron.nl "docker-compose -p atdb -f /data/docker_compose/docker-compose-atdb-ldv-acc-cd.yml up -d"
-  when: manual
-  only:
-    - release
-
 # deploy release version on 'sdc.astron.nl'
 docker-deploy-release:
   image: docker:latest