[GitLab] How to build jar file automatically

Problem
If I hope GitLab can build a jar file when I commit source code, how to do it?
I am using Maven 3.3.3 and JDK 7 in eclipse, and using mvn clean install -Dmaven.test.skip=true to build WAR file in eclipse.

How-To
Step 1. Add .gitlab-ci.yml to the root directory of my project, the content looks like:

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image: maven:3.3.3-jdk-7 build: stage: build script: - "mvn clean install -Dmaven.test.skip=true" artifacts: expire_in: 1 week when: on_success paths: - target/*.jar

Step 2. Add, commit and push .gitlab-ci.yml to GitLab
Step 3. Seeing the status of your pipeline and jobs 


Reference
[1] https://docs.gitlab.com/ce/ci/quick_start/README.html