DO-2031: ARM64 container support via QEMU/Buildx emulation

Author: crispy101

docs/aws-cdk.md

@@ -10,6 +10,7 @@ A streamlined AWS CDK workflow supporting multi-environment infrastructure synth
 - **PR diff comments**: When running a diff on a pull request, the result is posted (or updated) as a PR comment
 - **Smart Node.js setup**: Automatic detection from .nvmrc file with dependency caching
 - **Package manager detection**: Automatic support for npm, yarn (classic/berry), and pnpm
+- **Cross-platform Docker builds**: ARM64 container support via QEMU/Buildx emulation
 - **Debug support**: Verbose logging and debug output for troubleshooting
 - **GitHub Environments support**: Credentials and stack names can be configured per-environment via GitHub Environment variables/secrets