fix: refactor setup (#1152)

* add setup steps

* refactoring

* omitempty

* cleanup

* fixes

internal/v2/command/setup_step5.go

@@ -0,0 +1,35 @@
+package command
+
+import (
+	"context"
+
+	iam_model "github.com/caos/zitadel/internal/iam/model"
+	"github.com/caos/zitadel/internal/v2/domain"
+	iam_repo "github.com/caos/zitadel/internal/v2/repository/iam"
+)
+
+type Step5 struct {
+	DefaultOrgIAMPolicy iam_model.OrgIAMPolicy
+}
+
+func (s *Step5) Step() domain.Step {
+	return domain.Step5
+}
+
+func (s *Step5) execute(ctx context.Context, commandSide *CommandSide) error {
+	return commandSide.SetupStep5(ctx, s)
+}
+
+func (r *CommandSide) SetupStep5(ctx context.Context, step *Step5) error {
+	fn := func(iam *IAMWriteModel) (*iam_repo.Aggregate, error) {
+		iamAgg := IAMAggregateFromWriteModel(&iam.WriteModel)
+		err := r.addDefaultOrgIAMPolicy(ctx, iamAgg, NewIAMOrgIAMPolicyWriteModel(iam.AggregateID), &domain.OrgIAMPolicy{
+			UserLoginMustBeDomain: step.DefaultOrgIAMPolicy.UserLoginMustBeDomain,
+		})
+		if err != nil {
+			return nil, err
+		}
+		return iamAgg, nil
+	}
+	return r.setup(ctx, step, fn)
+}