[MM-35861] Add missing migration transformation (#17647)

app/permissions_migrations.go

@@ -902,6 +902,19 @@ func (a *App) getAddAuthenticationSubsectionPermissions() (permissionsMap, error
 	return transformations, nil
 }
 
+// This migration fixes https://github.com/mattermost/mattermost-server/issues/17642 where this particular ancillary permission was forgotten during the initial migrations
+func (a *App) getAddTestEmailAncillaryPermission() (permissionsMap, error) {
+	transformations := []permissionTransformation{}
+
+	// Give these ancillary permissions to anyone with WRITE_ENVIRONMENT_SMTP
+	transformations = append(transformations, permissionTransformation{
+		On:  permissionExists(model.PERMISSION_SYSCONSOLE_WRITE_ENVIRONMENT_SMTP.Id),
+		Add: []string{model.PERMISSION_TEST_EMAIL.Id},
+	})
+
+	return transformations, nil
+}
+
 // DoPermissionsMigrations execute all the permissions migrations need by the current version.
 func (a *App) DoPermissionsMigrations() error {
 	return a.Srv().doPermissionsMigrations()
@@ -939,6 +952,7 @@ func (s *Server) doPermissionsMigrations() error {
 		{Key: model.MIGRATION_KEY_ADD_ENVIRONMENT_SUBSECTION_PERMISSIONS, Migration: a.getAddEnvironmentSubsectionPermissions},
 		{Key: model.MIGRATION_KEY_ADD_ABOUT_SUBSECTION_PERMISSIONS, Migration: a.getAddAboutSubsectionPermissions},
 		{Key: model.MIGRATION_KEY_ADD_REPORTING_SUBSECTION_PERMISSIONS, Migration: a.getAddReportingSubsectionPermissions},
+		{Key: model.MIGRATION_KEY_ADD_TEST_EMAIL_ANCILLARY_PERMISSION, Migration: a.getAddTestEmailAncillaryPermission},
 	}
 
 	roles, err := s.Store.Role().GetAll()