This package[1] is a replacement for the old phantomjs-integration[2]
which is practically EOL. It is basically used to render PNGs of panels
that triggered an alert in Grafana.
This package internally uses `puppeteer`[3] to control a headless
Chromium instance. Even though puppeteer recommends to use a fixed
revision of `chromium`, I checked that our default `pkgs.chromium` works
fine as well. Also, I don't think it's a good idea to use outdated
browser versions[4].
I used the latest revision from `master` on purpose since compiling the
code with `tsc` from `v2.0` didn't work and I couldn't figure out why.
[1] https://grafana.com/grafana/plugins/grafana-image-renderer
[2] https://grafana.com/blog/2020/05/07/grafana-7.0-preview-new-image-renderer-plugin-to-replace-phantomjs/
[3] https://github.com/puppeteer/puppeteer
[4] currently, puppeteer v2.0.0 is used which recommends revision 706915
(v79.0.3945.130).
