feat: add lambda layer support for ap-southeast-5 (#2091)

[supermadu7]

Motivation

AWS has officially launched the ap-southeast-5 region in Malaysia. Currently, developers looking to deploy serverless PHP applications to this new region cannot leverage Bref runtimes because the region identifier is missing from the core configuration layout.

Adding ap-southeast-5 to the list of recognized regions ensures that the deployment utilities and Serverless framework integrations can successfully resolve and reference Bref's published Lambda layers in the Malaysia data centers, expanding the framework's global infrastructure reach.

Related Issues

Resolves #2091

[mnapoli]

Thanks, this needs more work than just this though (enabling the region in AWS for the Bref account, adding the region in the other repos, rebuilding everything, etc.).

I'll hold this off for now.

[supermadu7]

No problem at all, I figured there would be some manual AWS account configuration and pipeline updates needed on your end to actually deploy the layers to the new region.

I'll leave this PR open and ready for whenever you decide to roll out ap-southeast-5. Let me know if there are any other specific repositories or deployment scripts I can help prep in the meantime.