I want to know what the `artifacts/m2` folder is for

[JohnNiang]

https://github.com/kubesphere/devops-java-sample/tree/master/artifacts/m2

This folder is too large.

--- /home/johnniang/Workspaces/johnniang/devops-java-sample ---------------------------------------------
 114.9 MiB [##########] /artifacts 
 69.2 MiB [###### ] /.git
 64.0 KiB [ ] /deploy
 56.0 KiB [ ] /src
 12.0 KiB [ ] LICENSE
 8.0 KiB [ ] README.md
 8.0 KiB [ ] /configuration
 8.0 KiB [ ] /.s2i
 8.0 KiB [ ] pom.xml
 4.0 KiB [ ] Jenkinsfile-on-prem
 4.0 KiB [ ] Jenkinsfile-online
 4.0 KiB [ ] Dockerfile-on-prem
 4.0 KiB [ ] Dockerfile-online
 4.0 KiB [ ] OWNERS
 4.0 KiB [ ] .gitignore

[JohnNiang]

It's not a good choice to place dependencies into git repo. Our git clone speed is not always faster than aliyun maven mirror, but for offline support purpose.

[JohnNiang]

Related #76