rocker/binder example build error

[trybik]

Bug description

myBinder example does not build

Expected behaviour

A launched Jupyter RStudio session on a myBinder infrastructure

Actual behaviour

The build produces the chown: invalid user: 'jovyan' error as seen in the screenshot:

How to reproduce

1. Go to https://mybinder.org/v2/gh/rocker-org/binder/master?urlpath=rstudio

Your personal set up

mybinder on-line infrastructure

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[julou]

same problem here when following rocker's instructions at https://hub.docker.com/r/rocker/binder
and when trying the example build too.

[julou]

After a few trials and errors, it seems that the issue was introduced with rocker/binder:4.0.0

Using the same Dockerfile but changing only the image version:
rocker/binder:3.6.3 => works
rocker/binder:4.0.0 => this bug
rocker/binder:4.0.2 => this bug