migrations in tests

[schmitch]

hello, we found through the dotnet/eShop a cool way to make use of aspire's testing capabilities. unfortunatly the things which slows our tests down extremly are the migrations.

however our migrations would run for each tests. the best thing however would be to run the migrations inside InitializeAsync once per test runner and use the postgres container that contains the migrations already run with data, is there a way to do that?