### Bug description

Quarto apparently requires Chrome or Chromium to render graphviz documents, but on Pop_OS 22.04, chromium is only available through flatpak.  The search method in puppeteer.ts#findChrome don't find the flatpak installation.

Steps to reproduce (Debian Linux assumed):
1) Uninstall Chrome/Chromium installed through deb package or `quarto tools install chromium` (this should remove `chromium-browser` from the path.
2) Install chromium using `flatpak install org.chromium.Chromium` (note, run this as user, not root).
3) Verify that chromium runs by executing `flatpak run org.chromium.Chromium`
4) Attempt to use quarto to render `foo.qmd` (attached).  This will generate the error.


[foo.qmd.txt](https://github.com/quarto-dev/quarto-cli/files/9844787/foo.qmd.txt)

I'm getting this error with  RStudio 2022.07.0+548 "Spotted Wakerobin" Release (34ea3031089fa4e38738a9256d6fa6d70629c822, 2022-07-06) for Ubuntu Jammy
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.12.8 Chrome/69.0.3497.128 Safari/537.36 and quarto version 1.0.37


Some quick tests with my machine verify that the command `flatpak info org.chromium.Chromium` can be used to test that chromium is installed using flatpak (and `which flatpak` can be used to test for flatpak.  The info command will return an error if chromium is not installed.
If it is installed, it can be launched using `flatpak run org.chromium.Chromium ...` where ... are the usual command line arguments.

### Checklist

- [X] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [X] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] Please document the operating system you're running. If on Linux, please provide the specific distribution.
cderv
2022-10-22T16:13:44Z
ralmond
enhancement
v1.4
open
Quarto deos not find chromium if installed through flatpak
https://github.com/quarto-dev/quarto-cli/issues/2980