Doris version 0.11.0 dockerfile ask maven version 3.6.0，but where is it???????

[yangbiao121]

[imay]

@yangbiao121

1. we have fixed mvn version to 3.6.3 in master branch.
2. It is not a good idea to build docker file yourself. we have already provided a docker image, you can use it directly.

I will close this issue.