fix(core): platform is ignored during asset bundling (#33865)

### Issue # (if applicable)

Closes #30239 



### Reason for this change

The ```BundlingOptions``` ```platform``` property is not being used in ```AssetBundlingBindMount``` or ```AssetBundlingVolumeCopy``` and is not passed as a command line option to Docker.

Fix makes the platform property work as described in ```BundlingOptions``` documentation: https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.BundlingOptions.html#platform.


### Description of changes

added ```platform: this.options.platform``` to ```AssetBundlingBindMount.run``` and ```AssetBundlingVolumeCopy.run``` in ```packages/aws-cdk-lib/core/lib/asset-staging.ts```


### Describe any new or updated permissions being added

N/A


### Description of how you validated changes

Added platform property to unit and integration tests

* ```packages/aws-cdk-lib/core/test/private/asset-staging.test.ts```
* ```packages/@aws-cdk-testing/framework-integ/test/aws-s3-assets/test/integ.assets.bundling.docker-opts.ts```



### 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: ejschaefer

packages/@aws-cdk-testing/framework-integ/test/aws-s3-assets/test/integ.assets.bundling.docker-opts.ts

@@ -16,6 +16,7 @@ new assets.Asset(stack, 'BundledAsset', {
       `,
     ],
     network: 'host',
+    platform: 'linux/amd64',
   },
 });
 /// !hide

packages/aws-cdk-lib/core/lib/private/asset-staging.ts

@@ -71,6 +71,7 @@ export class AssetBundlingBindMount extends AssetBundlingBase {
         ...(this.options.volumes ?? []),
       ],
       network: this.options.network,
+      platform: this.options.platform,
     });
   }
 }
@@ -189,6 +190,7 @@ export class AssetBundlingVolumeCopy extends AssetBundlingBase {
         this.copyContainerName,
         ...(this.options.volumesFrom ?? []),
       ],
+      platform: this.options.platform,
     });
 
     this.copyOutputTo(this.options.bundleDir);

packages/aws-cdk-lib/core/test/private/asset-staging.test.ts

@@ -26,6 +26,7 @@ describe('bundling', () => {
       bundleDir: '/tmp/output',
       image: DockerImage.fromRegistry('public.ecr.aws/docker/library/alpine'),
       user: '1000',
+      platform: 'linux/amd64',
     };
     const helper = new AssetBundlingVolumeCopy(options);
     helper.run();
@@ -78,6 +79,7 @@ describe('bundling', () => {
     // actual docker run
     expect(spawnSyncStub.calledWith(DOCKER_CMD, sinon.match.array.contains([
       'run', '--rm',
+      '--platform', 'linux/amd64',
       '--volumes-from', helper.copyContainerName,
       'public.ecr.aws/docker/library/alpine',
     ]), { encoding: 'utf-8', stdio: ['ignore', process.stderr, 'inherit'] })).toEqual(true);
@@ -100,6 +102,7 @@ describe('bundling', () => {
       image: DockerImage.fromRegistry('public.ecr.aws/docker/library/alpine'),
       user: '1000',
       network: 'host',
+      platform: 'linux/amd64',
     };
     const helper = new AssetBundlingBindMount(options);
     helper.run();
@@ -108,6 +111,7 @@ describe('bundling', () => {
     expect(spawnSyncStub.calledWith(DOCKER_CMD, sinon.match.array.contains([
       'run', '--rm',
       '--network', 'host',
+      '--platform', 'linux/amd64',
       '-v',
       'public.ecr.aws/docker/library/alpine',
     ]), { encoding: 'utf-8', stdio: ['ignore', process.stderr, 'inherit'] })).toEqual(true);