Fix ccache for coverage and pecl builds

[iluuu1994]

Coverage cannot use ccache as it is incompatible with gcov. Pecl clones PHP to the ./php directory, rather than the cwd.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.20%. Comparing base (db0e365) to head (63a0581).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #21285       +/-   ##
===========================================
+ Coverage        0   54.20%   +54.20%     
===========================================
  Files           0      858      +858     
  Lines           0   341554   +341554     
  Branches        0    69330    +69330     
===========================================
+ Hits            0   185137   +185137     
- Misses          0   104079   +104079     
- Partials        0    52338    +52338     

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