add final step for branch protection

[ScharfViktor]

related: opencloud-eu/qa#81

Now the all-check-finished returns exit(0) if all tests pass, or exit(1) if any tests fail—we made this step required to protect the branch

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[individual-it]

This would mean that the chat notification step will also show as "fail" when there are other failed steps, but that should be OK, because in that case CI is already red

[ScharfViktor]

This would mean that the chat notification step will also show as "fail" when there are other failed steps, but that should be OK, because in that case CI is already red

yes, It will failed, but sends notification

[micbar]

Almost there.

[kulmann]

I don't know how to make github to like it 🙈 the status doesn't seem to be reported... edit: ah lol, my screenshot wasn't even from this PR. Is the status a push-thing? this PR here is green... nevermind then I guess.