trying 'staging' step instead of 'deploy to acceptance'

.gitlab-ci.yml

 stages:
   - build
+  - staging
   - deploy
 
-docker-build-master:
+docker-build:
   # Official docker image.
   image: docker:latest
   stage: build
@@ -72,6 +73,25 @@ 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