install libxss1 to fix missing libXss.so.1

[philippotto]

Also see puppeteer/puppeteer#6192 (comment)

[daniel-wer]

In the linked PR, a maintainer mentioned that people should switch to google-chrome-stable and the docs were adapted accordingly. We could also do that to avoid such problems in the future. I'd guess that we don't need libxss1, then.

[philippotto]

Yeah, I read that, too, but the comments didn't really confirm (only suggested) that switching from unstable to stable really fixes this particular issue. But we can certainly try it out. Would be the more stable route in the long-term. I'll open a second PR.

[jstriebel]

Waiting for result from #20, but LGTM 👍

[philippotto]

There still seems to be an issue (see https://app.circleci.com/pipelines/github/scalableminds/webknossos/2095/workflows/d7696ec9-b772-47f9-913d-91872a55c513/jobs/13296) with the missing libXss.so which is why I'd like to merge this PR, too. I've left chrome at stable for now. If this doesn't work for us (maybe there will be new problems), we can switch to unstable again. Agree?

[jstriebel]

Sure 👍