Fix Postgres CI runs

[S7evinK]

For some reason Postgres wouldn't allow connections over TCP. Since the tests are run in isolation, this allows all "peer" authed connections without a password.

For CI to be fully happy, we need #3397

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.50%. Comparing base (9897959) to head (2eff4f1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3399      +/-   ##
==========================================
- Coverage   67.54%   67.50%   -0.04%     
==========================================
  Files         521      521              
  Lines       47381    47381              
==========================================
- Hits        32002    31984      -18     
- Misses      11394    11412      +18     
  Partials     3985     3985              

Flag	Coverage Δ
unittests	52.79% <ø> (-0.02%)	⬇️

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[S7evinK]

Fixed with #3360, as it was touching those files anyway.