## Context
This refactoring improves scalability in the workspace migration runner
in terms of actions. Instead of relying on a switch case and multiple
changes and services + duplicate things between metadata and workspace
schema, we now have a unique module for all kind of actions and a
registry pattern to register them and run them dynamically.
Example on how to add a new "create_role" action with the future design:
```typescript
// packages/twenty-server/src/engine/workspace-manager/workspace-migration-v2/workspace-migration-runner-v2/action-handlers/role/services/create-role-action-handler.service.ts
export class CreateRoleActionHandlerService extends WorkspaceMigrationRunnerActionHandler(
'create_role',
) {
constructor(
private readonly workspaceSchemaManagerService: WorkspaceSchemaManagerService,
private readonly roleRepository: Repository<Role>,
) {}
async executeForMetadata(
context: WorkspaceMigrationActionRunnerArgs<CreateRoleAction>,
): Promise<void> {
this.roleRepository.save({...}); // technically could use the queryRunner from context param directly instead of injecting the repository
}
async executeForWorkspaceSchema(
context: WorkspaceMigrationActionRunnerArgs<CreateRoleAction>,
): Promise<void> {
// this.workspaceSchemaManagerService.tableManager... -> Nothing to do in the workspace schema in the role case
}
}
```
```typescript
// packages/twenty-server/src/engine/workspace-manager/workspace-migration-v2/workspace-migration-runner-v2/action-handlers/workspace-schema-migration-runner-action-handlers.module.ts
@Module({
imports: [WorkspaceSchemaManagerModule, +TypeOrmModule.forFeature([Role]),
providers: [
...
+RoleCreateActionService
],
})
export class WorkspaceSchemaMigrationRunnerActionHandlersModule {}
```
```typescript
export type WorkspaceMigrationAction=
| WorkspaceMigrationObjectAction
...
+| WorkspaceMigrationRoleAction;
export type CreateRoleAction = {
type = 'create_role',
role: RoleEntity
};
export type WorkspaceMigrationRoleAction = CreateRoleAction;
```
