Sample Gitlab CI YAML

before_script:
# if you are behind a proxy
#    - echo "Acquire::http::Proxy \"http://xyz:port\";" >> /etc/apt/apt.conf.d/01-proxy.conf
    - apt-get update -qq
    - curl -o maven.tgz http://mirror.symnds.com/software/Apache/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
    - tar xf maven.tgz
stages:
  - build
  - stage
  - release
  - devdeployment

build:
  stage: build
  script:
    - ./apache-maven-3.3.9/bin/mvn clean verify --settings settings.xml

stage:
  stage: stage
  script:
    - ./apache-maven-3.3.9/bin/mvn clean deploy --settings settings.xml

devdeployment:
  stage: devdeployment
  script:
    - ./apache-maven-3.3.9/bin/mvn clean package --settings settings.xml
    
#release:
#  stage: release
#  script:
#    - ./apache-maven-3.3.9/bin/mvn release:clean release:prepare release:perform --settings settings.xml
#  when: manual

Hello,
Do you use the release stage ? With Jenkins, I can specify the release version but with gitlab-ci, I can't find how to do.