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