feat(amplify): support build compute type (#34796)

### Issue # (if applicable)

N/A

### Reason for this change
Amplify supports  customizable build instances, but L2 Construct does not support it.
https://aws.amazon.com/about-aws/whats-new/2025/05/aws-amplify-hosting-customizable-build-instances/



### Description of changes
Add `buildComputeType` property.



### Describe any new or updated permissions being added
N/A



### Description of how you validated changes
Add unit tests and an integ test.


### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: mazyu36

packages/@aws-cdk/aws-amplify-alpha/README.md

@@ -353,6 +353,18 @@ const amplifyApp = new amplify.App(this, 'MyApp', {
 });
 ```
 
+## Build Compute Type
+
+You can specify the build compute type by setting the `buildComputeType` property.
+
+For more information, see [Configuring the build instance for an Amplify application](https://docs.aws.amazon.com/amplify/latest/userguide/custom-build-instance.html).
+
+```ts
+const amplifyApp = new amplify.App(this, 'MyApp', {
+  buildComputeType: amplify.BuildComputeType.LARGE_16GB,
+});
+```
+
 ## Deploying Assets
 
 `sourceCodeProvider` is optional; when this is not specified the Amplify app can be deployed to using `.zip` packages. The `asset` property can be used to deploy S3 assets to Amplify as part of the CDK:

packages/@aws-cdk/aws-amplify-alpha/lib/app.ts

@@ -184,6 +184,13 @@ export interface AppProps {
    * @default undefined - a new role is created when `platform` is `Platform.WEB_COMPUTE` or `Platform.WEB_DYNAMIC`, otherwise no compute role
    */
   readonly computeRole?: iam.IRole;
+
+  /**
+   * Specifies the size of the build instance.
+   *
+   * @default undefined - Amplify default setting is `BuildComputeType.STANDARD_8GB`.
+   */
+  readonly buildComputeType?: BuildComputeType;
 }
 
 /**
@@ -311,6 +318,7 @@ export class App extends Resource implements IApp, iam.IGrantable {
       repository: sourceCodeProviderOptions?.repository,
       customHeaders: props.customResponseHeaders ? renderCustomResponseHeaders(props.customResponseHeaders, this) : undefined,
       platform: appPlatform,
+      jobConfig: props.buildComputeType ? { buildComputeType: props.buildComputeType } : undefined,
     });
 
     this.appId = app.attrAppId;
@@ -648,3 +656,25 @@ export enum CacheConfigType {
    */
   AMPLIFY_MANAGED_NO_COOKIES = 'AMPLIFY_MANAGED_NO_COOKIES',
 }
+
+/**
+ * Specifies the size of the build instance.
+ *
+ * @link https://docs.aws.amazon.com/amplify/latest/userguide/custom-build-instance.html
+ */
+export enum BuildComputeType {
+  /**
+   * vCPUs: 4, Memory: 8 GiB, Disk space: 128 GB
+   */
+  STANDARD_8GB = 'STANDARD_8GB',
+
+  /**
+   * vCPUs: 8, Memory: 16 GiB, Disk space: 128 GB
+   */
+  LARGE_16GB = 'LARGE_16GB',
+
+  /**
+   * vCPUs: 36, Memory: 72 GiB, Disk space: 256 GB
+   */
+  XLARGE_72GB = 'XLARGE_72GB',
+}

packages/@aws-cdk/aws-amplify-alpha/test/app.test.ts

@@ -633,3 +633,17 @@ test('throws when compute role is set with a non SSR app', () => {
     });
   }).toThrow('`computeRole` can only be specified for `Platform.WEB_COMPUTE` or `Platform.WEB_DYNAMIC`.');
 });
+
+test.each([amplify.BuildComputeType.STANDARD_8GB, amplify.BuildComputeType.LARGE_16GB, amplify.BuildComputeType.XLARGE_72GB])('create an app with buildComputeType is set to %s', (buildComputeType) => {
+  // WHEN
+  new amplify.App(stack, 'App', {
+    buildComputeType,
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::Amplify::App', {
+    JobConfig: {
+      BuildComputeType: buildComputeType,
+    },
+  });
+});