git: setup ccache

[codecov-commenter]

Codecov Report

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

Project coverage is 24.80%. Comparing base (04934e2) to head (905c9b4). Report is 2 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #106 +/- ## ========================================== - Coverage 24.81% 24.80% -0.02% ========================================== Files 164 164 Lines 10335 10341 +6 Branches 5758 5761 +3 ========================================== Hits 2565 2565 - Misses 4977 4982 +5 - Partials 2793 2794 +1 ```

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