Adds support for using custom dockerfiles to pre-install image
renderer plugins.
Updates docs for docker and image rendering.
Fixes#20241
Co-Authored-By: Leonard Gram <leo@xlson.com>
* Add docker-compose example for running grafana with remote renderer
* Update docs/sources/administration/image_rendering.md
Co-Authored-By: Marcus Efraimsson <marcus.efraimsson@gmail.com>
Adds a new "Image Rendering" page in Administration section.
Updates configuration page with rendering settings and also
default.ini and sample.ini.
Updates and cleanup pages that referencing image rendering.
Ref #18914