Speed up CI allowing the usage of all the cores available

[danielealbano]

Currently the build pipeline uses an hardcoded number of jobs for make, the codeql pipeline uses nothing at all.

This PR sets the number of jobs using nproc to leverage in full the resources available.

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.05 :warning:

Comparison is base (cd4ee86) 81.99% compared to head (c815ad8) 81.94%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #289 +/- ## ========================================== - Coverage 81.99% 81.94% -0.05% ========================================== Files 162 162 Lines 10980 10980 ========================================== - Hits 9003 8997 -6 - Misses 1977 1983 +6 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `81.94% <ø> (-0.05%)` | :arrow_down: | 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=Daniele+Salvatore+Albano#carryforward-flags-in-the-pull-request-comment) to find out more. [see 2 files with indirect coverage changes](https://codecov.io/gh/danielealbano/cachegrand/pull/289/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Daniele+Salvatore+Albano) Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Daniele+Salvatore+Albano). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Daniele+Salvatore+Albano)

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