Running Integration Tests against Postgres Database (#838)

* Allow configuring postgres with environment variables

(cherry picked from commit 8439df78fea25656a9a1275d2a2fe3f0df0528c7)

* Fix process provider when environment variables alread exist

[common]

(cherry picked from commit 66e5b4025974e081c1406f01a860b1ac52949c22)

* First bash at running integration tests on postgres

(cherry picked from commit f950e80c7e4f9b088ec6a149386160eab83b61c3)

* Postgres integration tests running as part of the build pipeline

(cherry picked from commit 9ca8616f5098778e9b5e6ce09d2aa11224018fab)

* Fixed: Register PostgresOptions when running in utility mode

* fixup!

* fixup!

* fixup!

* fixup!

* fixup!

Co-authored-by: ta264 <ta264@users.noreply.github.com>
Co-authored-by: Qstick <qstick@gmail.com>

src/NzbDrone.Core.Test/Framework/TestDatabase.cs

@@ -23,6 +23,7 @@ namespace NzbDrone.Core.Test.Framework
             where T : ModelBase, new();
         IDirectDataMapper GetDirectDataMapper();
         IDbConnection OpenConnection();
+        DatabaseType DatabaseType { get; }
     }
 
     public class TestDatabase : ITestDatabase
@@ -30,6 +31,8 @@ namespace NzbDrone.Core.Test.Framework
         private readonly IDatabase _dbConnection;
         private readonly IEventAggregator _eventAggregator;
 
+        public DatabaseType DatabaseType => _dbConnection.DatabaseType;
+
         public TestDatabase(IDatabase dbConnection)
         {
             _eventAggregator = new Mock<IEventAggregator>().Object;