fix(worker): enable safe multi-instance job processing

Tiku.IntegrationTests/Infrastructure/PostgresTestDatabase.cs

@@ -119,7 +119,7 @@ internal sealed class PostgresTestDatabaseTemplate : IDisposable
     public static PostgresTestDatabaseTemplate Create()
     {
         var adminConnectionString = Environment.GetEnvironmentVariable("TIKU_TEST_POSTGRES_ADMIN") ??
-                                    $"Host=localhost;Database=postgres;Username={Environment.UserName};Pooling=false;Timeout=5;Command Timeout=60";
+                                    DockerPostgresTestDefaults.AdminConnectionString;
         var adminBuilder = new NpgsqlConnectionStringBuilder(adminConnectionString);
         if (!string.Equals(adminBuilder.Database, "postgres", StringComparison.OrdinalIgnoreCase))
             throw new InvalidOperationException(
@@ -171,4 +171,4 @@ internal sealed class PostgresTestDatabaseTemplate : IDisposable
             throw;
         }
     }
-}
+}