Use gitlab ci to automatically release versions to ivy repo in another branch

.gitlab-ci.yml

+variables:
+  GIT_STRATEGY: clone
+  ARTIFACT_DIR: build/repo/ecore2java
+
+build:
+  stage: build
+  image: nimmis/alpine-java:openjdk-8-jdk
+  variables:
+    GRADLE_OPTS: "-Dorg.gradle.daemon=false"
+  before_script:
+    - export GRADLE_USER_HOME=`pwd`/.gradle
+  script:
+    - ./gradlew publish
+  artifacts:
+    paths:
+      - $ARTIFACT_DIR
+    expire_in: 10min
+  cache:
+    paths:
+      - .gradle/wrapper
+      - .gradle/caches
+  only:
+    - tags
+  tags:
+    - dockered
+
+publish:
+  stage: deploy
+  image: bravissimolabs/alpine-git
+  before_script:
+    - mkdir -pvm 0700 ~/.ssh
+    - echo "$SSH_SECRET_DEPLOY_KEY" | tr -d '\r' > ~/.ssh/id_rsa
+    - chmod 600 ~/.ssh/id_rsa
+    - ssh-keyscan -H "git-st.inf.tu-dresden.de" >> ~/.ssh/known_hosts
+    - git config user.name "$GITLAB_USER_NAME"
+    - git config user.email "$GITLAB_USER_EMAIL"
+    - git remote set-url --push origin `echo $CI_REPOSITORY_URL | sed -E 's/.*@([^\/]+?(\:\d+)?)\//git@\1:/'`
+    - export VERSION=${CI_COMMIT_TAG:-`git describe --tags --always`}
+    - echo $VERSION
+  script:
+    - git checkout ivy-repo || git checkout --orphan ivy-repo
+    - git reset
+    - cp -r $ARTIFACT_DIR .
+    - git add $(git ls-files -o ecore2java)
+    - git commit -m "[skip ci] Automatic release of version $VERSION"
+    - git push --set-upstream origin ivy-repo
+  after_script:
+    - rm -rfv ~/.ssh
+  only:
+    - tags
+  tags:
+    - dockered