Fix the dynamic payload validation (#445)

Author: Noah Lee

Diff for: internal/interactor/validator.go

@@ -176,6 +176,10 @@ type DynamicPayloadValidator struct {
 }
 
 func (v *DynamicPayloadValidator) Validate(d *ent.Deployment) error {
+	if d.IsRollback {
+		return nil
+	}
+
 	if !v.Env.IsDynamicPayloadEnabled() {
 		return nil
 	}

Diff for: internal/interactor/validator_test.go

@@ -138,3 +138,13 @@ func TestSerializationValidator_Validate(t *testing.T) {
 		}
 	})
 }
+
+func TestDynamicPayloadValidator_Validate(t *testing.T) {
+	t.Run("Returns nil if it is rollback.", func(t *testing.T) {
+		v := &i.DynamicPayloadValidator{Env: &extent.Env{}}
+
+		if err := v.Validate(&ent.Deployment{IsRollback: true}); err != nil {
+			t.Fatalf("Validate returns an error: %s", err)
+		}
+	})
+}