Sample for AWS Lambda

[eamsden]

What was changed

Added sample for AWS Lambda

Why?

Checklist

1. Depends on AWS Lambda (Java) sdk-java#2901

2. Closes

3. How was this tested:
   Deployed a lambda worker to my sandbox AWS account and Temporal cloud.

4. Any docs updates needed?

[dplyukhin]

Should this section also explain how to use otel-collector-config.template.yaml?

[dplyukhin]

I didn't run this part myself, but Codex thinks there's an issue:

The README says the tutorial supports either Temporal Cloud or self-hosted Temporal, but the invocation role trusts fixed
Temporal Cloud AWS principals at lambda-worker/deploy/iam-role-for-temporal-lambda-invoke-test.yaml:48. That template will not configure self-hosted Worker Controller credentials. Temporal’s guide explicitly gives self-hosting a separate setup
and requires Temporal Service 1.31.0 or later.

[dplyukhin]

FWIW Codex complains here, though I don't understand what it's talking about. In case it's useful to you:

README claims Worker Deployment Versioning but uses mutable Lambda code.

The tutorial obtains an unqualified function ARN at lambda-worker/README.md:151, then associates that with a Temporal Build ID at lambda-worker/README.md:193. The update script later replaces the code behind that same ARN without changing the Build ID.

That undermines the immutability and rollback guarantees readers normally expect from Worker Deployment Versioning. Temporal recommends publishing an immutable Lambda version and assigning its qualified ARN to each distinct Build ID. Unqualified ARNs are acceptable for development, but the tutorial should identify that trade-off explicitly.