Dockerfile RUN chown does not work

I want to create image from jenkins and copy into image jenkins jobs.
I try to copy into image directory with jobs definiitions and set into jobs directory permissions for jenkins user.

In a Dockerfile I do the following:

FROM jenkins:2.60.1
USER root

RUN mkdir /var/jenkins_home/jobs
COPY jobs/ /var/jenkins_home/jobs/
RUN chmod -R 755 /var/jenkins_home/jobs && chown -R jenkins:jenkins /var/jenkins_home/jobs
USER jenkins
RUN ls -la /var/jenkins_home

I get:
drwxr-xr-x 3 root root 4096 Jul 20 11:18 jobs
User jenkins have no permissions to jobs directory.
I can not add new job definition from the Jenkins GUI because of no permissions for jenkins user.

I try to run the image on Windows 7 (docker toolbox).

The docker version command returns:
Version: 17.05.0-ce
API version: 1.29
Go version: go1.7.5
Git commit: 89658be
Built: Fri May 5 15:36:11 2017
OS/Arch: windows/amd64

Version: 17.06.0-ce
API version: 1.30 (minimum version 1.12)
Go version: go1.8.3
Git commit: 02c1d87
Built: Fri Jun 23 21:51:55 2017
OS/Arch: linux/amd64
Experimental: false