fix(@schematics/angular): warn when production configuration is missing for service worker

When adding service worker support to a project, the schematic attempts to add the `serviceWorker` option to the `production` build configuration. If the `production` configuration is missing, the schematic would previously do nothing and not inform the user.

This change adds a warning message to the console when the `production` configuration is not found, making it clear to the user why the `serviceWorker` option was not added.

Fixes #32399

Author: alan-agius4

packages/schematics/angular/service-worker/index.ts

@@ -106,7 +106,7 @@ function getTsSourceFile(host: Tree, path: string): ts.SourceFile {
 }
 
 const serviceWorkerSchematic: RuleFactory<ServiceWorkerOptions> = createProjectSchematic(
-  async (options, { project, workspace, tree }) => {
+  async (options, { project, workspace, tree, logger }) => {
     if (project.extensions.projectType !== 'application') {
       throw new SchematicsException(`Service worker requires a project type of "application".`);
     }
@@ -126,6 +126,10 @@ const serviceWorkerSchematic: RuleFactory<ServiceWorkerOptions> = createProjectS
       const productionConf = buildTarget.configurations?.production;
       if (productionConf) {
         productionConf.serviceWorker = ngswConfigPath;
+      } else {
+        logger.warn(
+          'No "production" configuration found for build target. "serviceWorker" option will not be set.',
+        );
       }
     } else {
       buildOptions.serviceWorker = true;