Add coverage badge

[lafrech]

Test coverage is computed during tests but not displayed anywhere.

It would be nice to setup a service such as Codecov to have it displayed, add a badge, get PR comments with diff coverage, etc.

I don't think I can setup Codecov because I'm not admin of this org so I can't create a token (but I might be mistaken about Codecov setup).

I'm open to suggestions about another service.

Or maybe an admin here can create the token and add it as CODECOV_TOKEN in Settings -> Security -> Secrets and variables -> Actions -> Repository secrets (@touilleMan ?) and then all it takes is add a last step in tests to build-release.yml.

  - name: Upload coverage
    uses: codecov/codecov-action@v5

[touilleMan]

I've added the CODECOV_TOKEN as Action secret 👍

Next step according to their doc:

[lafrech]

Thanks @touilleMan!

umongo 4 is almost ready. Not sure I'll figure out #403 before releasing. I might make the pot update more or less manually.

Would you like me to hold de release until you get the time to take a look at it?

[lafrech]

Actually, the badge doesn't show up.

Do we need a token in the badge URL (why?) or do we need to set the name of the default branch correctly (more likely but I can't do that)?

There doesn't seem to be a way to specify the branch in the badge URL.

I changed default branch to main.

[touilleMan]

Would you like me to hold de release until you get the time to take a look at it?

@lafrech I don't use MongoDB anymore, so it's all up to you ;-)

[lafrech]

OK, no pb. I don't use MongoDB either anymore. I just find it sad to keep this nice piece of software unmaintained, and nobody really stood out to do it, so I figured I should merge the PRs fixing dependencies compatibility, and then I got caught into it and I ended up spending hours on the whole upgrade... Hence my will to advertise here about sponsoring through marshmallow OpenCollective.

[lafrech]

Actually, the badge doesn't show up.

Do we need a token in the badge URL (why?) or do we need to set the name of the default branch correctly (more likely but I can't do that)?

There doesn't seem to be a way to specify the branch in the badge URL.

I changed default branch to main.

@touilleMan, do you think you could have a look at this in codecov config?

Thx!