CI: Test report fails due to protections

[jtxa]

After the workflow was accepted from PR #7 it only works fully for @sierrafoxtrot
The follow-up PRs from other people fail due to some protection problems:

Error: HttpError: Resource not accessible by integration

As @marcows pointed out here, this seems to be a common problem.

If I understand that correctly, it does only work for people having write access, which makes it more or less useless in this form.

[jtxa]

@sierrafoxtrot
I suggest that you remove the test report step from the workflow and push that directly to master.
Otherwise the PRs get stuck.

The test-reporter README explains the correct usage in "Recommended setup for public repositories". I will do that on a later PR and try to test it beforehand.
I wasn't aware that such problems (security settings) exist on GitHub.

[sierrafoxtrot]

Done.