Is it possible to pass config options for browser launch?
Running into issues when trying to run continuous integration (CircleCi)
Launching Headless Chrome
Failed to launch chrome!
[0731/172545.445686:ERROR:zygote_host_impl_linux.cc(89)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.
Yes, should be possible. The chromeLaunchConfig object in Pa11y's settings accepts Puppeteer config options, including args, which passes Chromium flags to the headless browser itself.
I haven't tested it, but something like this should hopefully work in your Pa11y CI settings:
chromeLaunchConfig: {
args: ['--no-sandbox']
}