ci: pre-install in separate step

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

easier to see what the real execution time

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70%. Comparing base (910c12d) to head (8b79a62).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #349   +/-   ##
===================================
- Coverage    70%    70%   -0%     
===================================
  Files         2      2           
  Lines       435    441    +6     
===================================
+ Hits        303    307    +4     
- Misses      132    134    +2