ci: auto-bump test

.gitlab-ci.yaml

+image: docker:latest
+
+services:
+  - docker:dind
+
+before_script:
+  - apk add --no-cache py-pip
+  - pip install docker-compose
+
+stages:
+  - auto-bump
+
+
+auto-bump:
+  stage: auto-bump
+  image: python:3.6
+  before_script:
+    - "which ssh-agent || ( apt-get update -qy && apt-get install openssh-client -qqy )"
+    - eval `ssh-agent -s`
+    - echo "${SSH_PRIVATE_KEY}" | tr -d '\r' | ssh-add - > /dev/null # add ssh key
+    - pip3 install -U Commitizen # install commitizen
+    - mkdir -p ~/.ssh
+    - chmod 700 ~/.ssh
+    - echo "$SSH_PUBLIC_KEY" >> ~/.ssh/id_rsa.pub
+    - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
+  script:
+    - git remote set-url origin git@gitlab.awi.de:paleodyn/Projects/awiesm-2.2-dev/parallel-coupling.git # git configuration
+    - git config --global user.email "${CI_EMAIL}" && git config --global user.name "${CI_USERNAME}"
+    - 'exists=`git show-ref refs/heads/master` && if [ -n "$exists" ]; then git branch -D master; fi'
+    - git checkout -b master
+    - cz bump # execute auto bump and push to master
+    - git push origin master:$CI_COMMIT_REF_NAME
+    - TAG=$(head -n 1 VERSION) # get the new software version and save into artifacts
+    - echo "#!/bin/sh" >> variables
+    - echo "export TAG='$TAG'" >> variables
+    - git push origin $TAG
+  only:
+    refs:
+      - master
+  artifacts:
+    paths:
+      - variables