Platform test: compare inferred types with real SQL engine results

[janedbal]

• This is a needed test before finalization of Autodetect driver setup for precise int/float/bool inference in expressions (stringified or not) #506.
• The intention here is to have real comparison of inferred types with real results for numerous database drivers, PHP versions, configurations and Doctrine versions.
• So far, it only asserts current behaviour and fixes boolean inferring for Postgres, but I think it will gain plenty of improvements once Autodetect driver setup for precise int/float/bool inference in expressions (stringified or not) #506 will be tested by that.
• In order to develop&test locally the same matrix as in CI, I added docker-compose setup copying the CI setup

[ondrejmirtes]

This is really nice :)

Two questions:

1. Why not cover PHP 7.2+?
2. Why not cover PHP 8.2+?

[janedbal]

Why not cover PHP 7.2+? Why not cover PHP 8.2+?

The main point of platform test is to cover different PHP behaviours and that changed only in PHP 8.1.

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Take this as a starting point, I have a big list of needed improvements of this test. Using complete range of PHP versions can be added.

[ondrejmirtes]

Thank you!