Fixing SQL exception during automatic migrations in PostgreSql

Fixes #6783
Fixes #7323

src/Orchard/Data/Migration/AutomaticDataMigrations.cs

@@ -80,12 +80,25 @@ public class AutomaticDataMigrations : IOrchardShellEvents {
         /// <summary>
         /// This ensures that the framework migrations have run for the distributed locking feature, as existing Orchard installations will not have the required tables when upgrading.
         /// </summary>
-        private void EnsureDistributedLockSchemaExists() {
+        private void EnsureDistributedLockSchemaExists()
+        {
             // Ensure the distributed lock record schema exists.
             var schemaBuilder = new SchemaBuilder(_dataMigrationInterpreter);
             var distributedLockSchemaBuilder = new DistributedLockSchemaBuilder(_shellSettings, schemaBuilder);
-            if (distributedLockSchemaBuilder.EnsureSchema())
+            if (!distributedLockSchemaBuilder.SchemaExists())
+            {
+
+                // Workaround to avoid some Transaction issue for PostgreSQL.
+                if (_shellSettings.DataProvider.Equals("PostgreSql", StringComparison.OrdinalIgnoreCase))
+                {
+                    _transactionManager.RequireNew();
+                    distributedLockSchemaBuilder.CreateSchema();
+                    return;
+                }
+
+                distributedLockSchemaBuilder.CreateSchema();
                 _transactionManager.RequireNew();
+            }
         }
     }
 }