ci: add codecov report

[mniestroj]

No description provided.

[github-actions]

Visit the preview URL for this PR (updated for commit bf58cdf):

https://golioth-firmware-sdk-doxygen-dev--pr654-codecov-test-n3map1r5.web.app

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[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
55	1	54	0

View the top 1 failed tests by shortest run time

sample.golioth sample.golioth.lightdb_get.test_lightdb_get

Stack Traces | 25.2s run time

No failure message available

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[mniestroj]

No plans to work on it anytime soon. In order to make use of Codecov test reporting, we would need to better extract information from our test runs and provide Codecov all data that it can parse / render. Not sure how useful it would be before implementing it. As we have fully open source and hosted tests results already implemented, it might not provide enough value to justify the effort. Closing for now.