UI: Add readonly query parameter to dashboard page

ui-ngx/src/app/modules/home/components/dashboard-page/dashboard-page.component.ts

@@ -466,7 +466,8 @@ export class DashboardPageComponent extends PageComponent implements IDashboardC
     this.singlePageMode = data.singlePageMode;
 
     this.readonly = this.embedded || (this.singlePageMode && !this.widgetEditMode && !this.route.snapshot.queryParamMap.get('edit'))
-                    || this.forceFullscreen || this.isMobileApp || this.authUser.authority === Authority.CUSTOMER_USER;
+                    || this.forceFullscreen || this.isMobileApp || this.authUser.authority === Authority.CUSTOMER_USER ||
+                    this.route.snapshot.queryParamMap.get('readonly') === 'true';
 
     this.dashboardCtx.aliasController = this.parentAliasController ? this.parentAliasController : new AliasController(this.utils,
       this.entityService,