feat: retry sending report when coveralls returns 502 #4
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Frequently, coveralls replies with a 502 HTTP status code response.
Ex: https://github.com/emqx/emqx/actions/runs/10946761255/job/30394403873#step:7:2031
Instead of failing the whole CI run for such transient errors, we add a sleep + retry here, limited to 5 extra attempts.