Please support something like "allow-failure" for a given job

Edit from @vanZeben:

As this is a GitHub Actions platform feature request, discussion for this feature has been moved to https://github.com/orgs/community/discussions/15452, please go and put your support behind that community discussion instead of this issue.

We use github actions in our "snapd" project and we love them.

One small feature we would love to see is a way to mark a test job as "allow-failure" (or a term along these lines) [0]. This would simply mean that the overall /pulls overview page would show the PR as with the little green tick-mark (and maybe in the tooltip 5/6 OK, 1 ignored). It would still show as a failure in the details view (maybe with a different icon?).

Our use-case is that we have some CI environments that fail frequently because of external factors like repository mirrors that are our of sync etc. We still want to run the CI on these systems but not get distracted too much by these out-of-our-control issues.

Hope this makes sense.

Thanks!
Michael

[0] E.g.

jobs:
  spread:
    runs-on: ubuntu-latest
    allow-failure: true
    steps:
    - do-some-flaky-stuff

Start with the linked GitHub Community discussion 15452, since the issue states that feature discussion moved there. The issue names no runner files, tests, or implementation entry points; completion would depend on an accepted GitHub Actions platform design rather than a repository-only change.