User id should not be forced when using dockerfile in pipeline.

As it is not safe to match username (user id are incremented on each user creation, host and container may not have the same one)

Here is a very very very simple example not working :

https://github.com/FanchTheSystem/UserPipelineDockerTest/blob/master/Jenkinsfile

https://github.com/FanchTheSystem/UserPipelineDockerTest/blob/master/Dockerfile

Here is a simple and ugly working workarround :

https://github.com/FanchTheSystem/UserPipelineDockerTest/blob/master/Jenkinsfile.working

https://github.com/FanchTheSystem/UserPipelineDockerTest/blob/master/Dockerfile.working

Here is the method, I think should be deleted () from your source code:

https://github.com/ndeloof/docker-workflow-plugin/blob/master/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L308

Related PR:

https://github.com/jenkinsci/docker-workflow-plugin/pull/57

https://github.com/jenkinsci/docker-workflow-plugin/pull/130

Thank you !