Move renovate build to separate workflow

[lucacome]

Proposed changes

The workflow needs to run only on PRs opened by renovate and not on other kinds of events.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.38%. Comparing base (f76267f) to head (fa5e972).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2712   +/-   ##
=======================================
  Coverage   89.38%   89.38%           
=======================================
  Files         110      110           
  Lines       10913    10913           
  Branches       50       50           
=======================================
  Hits         9755     9755           
  Misses       1100     1100           
  Partials       58       58           

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