Add Codecov badge

[westonruter]

Relates to #1789

It would be nice to add badges distinct for each plugin, and apparently this is possible if we configure flags: https://community.codecov.com/t/coverage-badge-on-a-per-directory-basis/3158

[ShyamGadde]

It would be nice to add badges distinct for each plugin, and apparently this is possible if we configure flags: https://community.codecov.com/t/coverage-badge-on-a-per-directory-basis/3158

@westonruter I just realized that my Option 1 suggestion here proposed adding per-plugin flags, which would also help with this coverage badge implementation—along with carrying forward coverage when doing partial testing.

Since PR #1838 hasn't been merged yet, would you recommend switching to Option 1 now? That way, we can solve both issues in a single step.

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[westonruter]

@ShyamGadde ah, right!

@swissspidy what do you think?

[westonruter]

In regards to having separate badges for each plugin, I will say that it is very easy to see the breakdown by plugin when going to https://app.codecov.io/gh/WordPress/performance

Or at https://app.codecov.io/gh/WordPress/performance/tree/trunk/plugins

@ShyamGadde so if the work needed to implement as you referred to in #1935 (comment) is high, then it may not be worth it.

[ShyamGadde]

@westonruter The work required to implement this isn’t actually that high. I already tested and verified the setup in a separate repo before suggesting it. So switching to Option 1 would be relatively quick and straightforward. Let me know if you'd like me to proceed with this!

[westonruter]

@ShyamGadde Sounds good to me.