Github CI with Postgres (#417)

* with postgres

* postgres test explicit

* make format

* start postgres only if needed

* remove if again

* print db

* db in matrix

* delete schema

* use new env var MINT_TEST_DATABASE for tests

* add db path to regtest

tests/helpers.py

@@ -31,6 +31,7 @@ is_fake: bool = WALLET.__class__.__name__ == "FakeWallet"
 is_regtest: bool = not is_fake
 is_deprecated_api_only = settings.debug_mint_only_deprecated
 is_github_actions = os.getenv("GITHUB_ACTIONS") == "true"
+is_postgres = settings.mint_database.startswith("postgres")
 
 docker_lightning_cli = [
     "docker",