Based on this PR
Add the missing part to add platform support when using lambda fromImageAsset

As we are not allowed to specify platform flag for DockerImageAsset, users deploying cdk on x86_64 platform will not be able to bundle lambda.DockerImageFunction for the new arm64 architecture. Similarly, users deploying cdk on arm64 architecture like Mac M1 will not be able to bundle images for AWS Fargate, which is x86_64 only.

builder experience with aws-lambda

For x86_64 users deploying Lambda functions with container runtime on Lambda Graviton2(arm64) from local container image assets with multi-architecture docker base images. Specify the platform to ensure the image would be built for ARM64 architecture.

 new DockerImageFunction(stack, 'Lambda', {
      code: DockerImageCode.fromImageAsset(path.join(__dirname, 'docker-arm64-handler')),
      architecture: Architecture.ARM_64,
    });

Fixes: #12472, #20907

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