* feature: add "packageManagerUrl" in _configmap.tpl

This is a prerequisite for further configuration in the various RStudio charts, following the recent PRs in Onyxia

* fix: duplicate line, unwanted comma

* bump library chart and chart versions

Co-authored-by: alexisdondon <alexisdondon@users.noreply.github.com>

* lint and update test image to make a curl instead of weird wget