fix(gradle): run gradle init if no settings.gradle (#23226)

<!-- Please make sure you have read the submission guidelines before
posting an PR -->
<!--
https://github.com/nrwl/nx/blob/master/CONTRIBUTING.md#-submitting-a-pr
-->

<!-- Please make sure that your commit message follows our format -->
<!-- Example: `fix(nx): must begin with lowercase` -->

## Current Behavior
<!-- This is the behavior we have today -->

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->

## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->

Fixes #

packages/gradle/src/generators/init/init.ts

@@ -8,13 +8,21 @@ import {
   Tree,
   updateNxJson,
 } from '@nx/devkit';
+import { execSync } from 'child_process';
 import { nxVersion } from '../../utils/versions';
 import { InitGeneratorSchema } from './schema';
 import { hasGradlePlugin } from '../../utils/has-gradle-plugin';
 
 export async function initGenerator(tree: Tree, options: InitGeneratorSchema) {
   const tasks: GeneratorCallback[] = [];
 
+  if (!tree.exists('settings.gradle') && !tree.exists('settings.gradle.kts')) {
+    logger.warn(`Could not find 'settings.gradle' or 'settings.gradle.kts' file in your gradle workspace.
+A Gradle build should contain a 'settings.gradle' or 'settings.gradle.kts' file in its root directory. It may also contain a 'build.gradle' or 'build.gradle.kts' file.
+Running 'gradle init':`);
+    execSync('gradle init', { stdio: 'inherit' });
+  }
+
   if (!options.skipPackageJson && tree.exists('package.json')) {
     tasks.push(
       addDependenciesToPackageJson(
@@ -66,11 +74,8 @@ function addProjectReportToBuildGradle(tree: Tree) {
     buildGradleFile = 'build.gradle.kts';
   } else if (tree.exists('settings.gradle')) {
     buildGradleFile = 'build.gradle';
-  } else {
-    throw new Error(
-      'Could not find settings.gradle or settings.gradle.kts file in your gradle workspace.'
-    );
   }
+
   let buildGradleContent = '';
   if (tree.exists(buildGradleFile)) {
     buildGradleContent = tree.read(buildGradleFile).toString();