chore: Add PostgreSQL Command Line Tools to README

[sandrask]

Add Command Line Tools installation to README

Signed-off-by: Sandra Vrtikapa sandra.vrtikapa@securekey.com

[codecov]

Codecov Report

Merging #1319 (b226f23) into main (15d6fcd) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1319      +/-   ##
==========================================
+ Coverage   87.86%   87.89%   +0.02%     
==========================================
  Files         190      190              
  Lines       18299    18221      -78     
==========================================
- Hits        16079    16015      -64     
+ Misses       1414     1406       -8     
+ Partials      806      800       -6     

Impacted Files	Coverage Δ
internal/pkg/ldcontext/ldcontext.go	63.15% <0.00%> (+1.61%)	⬆️
pkg/vct/proofmonitoring/monitoring.go	86.36% <0.00%> (+2.72%)	⬆️
pkg/resolver/resource/resolver.go	100.00% <0.00%> (+9.19%)	⬆️

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