updating ci rule for PRs

[scarrazza]

Checklist:

• [ ] Reviewers confirm new code works as expected.
• [ ] Tests are passing.
• [ ] Coverage does not decrease.
• [ ] Documentation is updated.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.59%. Comparing base (a514441) to head (869681c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #886 +/- ## ======================================= Coverage 66.59% 66.59% ======================================= Files 55 55 Lines 5942 5942 ======================================= Hits 3957 3957 Misses 1985 1985 ``` | [Flag](https://app.codecov.io/gh/qiboteam/qibolab/pull/886/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/qiboteam/qibolab/pull/886/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | `66.59% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam#carryforward-flags-in-the-pull-request-comment) to find out more.

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[alecandido]

In case someone will ever wonder about, this is the twin of https://github.com/qiboteam/qibo/pull/1307