Generator: add testcontainers to PostgreSQL

[pascalgrimaud]

Fix #126

[codecov]

Codecov Report

Merging #131 (ddea7a8) into main (e04a07a) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #131   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       262       267    +5     
===========================================
  Files             41        42    +1     
  Lines            868       893   +25     
  Branches          23        23           
===========================================
+ Hits             868       893   +25     

Impacted Files	Coverage Δ
...boot/application/PostgreSQLApplicationService.java	100.00% <100.00%> (ø)
...enerator/springboot/domain/service/PostgreSQL.java	100.00% <100.00%> (ø)
...ngboot/domain/service/PostgreSQLDomainService.java	100.00% <100.00%> (ø)

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