feat: add TenancyConfig to ACK Lambda Controller

[acaremrullah]

Issue #, if available: N/A

Description of changes:

Summary

Adds support for AWS Lambda's Tenant Isolation Mode feature to enable per-tenant isolation for multi-tenant applications.

Changes

SDK Update

• Upgraded github.com/aws/aws-sdk-go-v2/service/lambda from v1.75.0 to v1.87.1 to include TenancyConfig API support

API Types

• Added TenancyConfig type with TenantIsolationMode field to apis/v1alpha1/types.go
• Added TenancyConfig field to FunctionSpec in apis/v1alpha1/function.go

Controller Implementation

• Updated pkg/resource/function/sdk.go to handle TenancyConfig in:
  • newCreateRequestPayload - sets TenancyConfig on CreateFunction API call
  • sdkFind - reads TenancyConfig from GetFunction response
  • sdkCreate - reads TenancyConfig from CreateFunction response

CRD Updates

• Regenerated CRD manifests with TenancyConfig field
• Updated both config/crd/bases/lambda.services.k8s.aws_functions.yaml and helm/crds/lambda.services.k8s.aws_functions.yaml

Testing

• Added example function manifest test/e2e/resources/function_tenancy.yaml demonstrating tenant isolation configuration

Usage Example

apiVersion: lambda.services.k8s.aws/v1alpha1
kind: Function
metadata:
  name: my-function
spec:
  name: my-function
  runtime: python3.9
  handler: index.handler
  role: arn:aws:iam::123456789012:role/lambda-role
  code:
    s3Bucket: my-bucket
    s3Key: function.zip
  tenancyConfig:
    tenantIsolationMode: "PER_TENANT"

AWS Documentation

• https://aws.amazon.com/about-aws/whats-new/2025/11/aws-lambda-tenant-isolation-mode/
• https://docs.aws.amazon.com/lambda/latest/api/API_TenancyConfig.html

Notes

• TenancyConfig cannot be modified after function creation (AWS API limitation)
• Only available in regions except Asia Pacific (New Zealand), AWS GovCloud (US), and China

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

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This pull-request has been approved by: acaremrullah
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[ack-prow]

Hi @acaremrullah. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[acaremrullah]

/assign @michaelhtm

[knottnt]

@acaremrullah Thanks for the PR! Left a few comments.

[knottnt]

Normally there would be an e2e test associated with the resources in this folder. Could you either add a test to validate setting the tenancy config or remove this?

[knottnt]

nit: Could you use v0.19.0 here.

[knottnt]

When adding a new field a CRD I'd expect to see some changes the files associated with our code-generator to fetch a new version of the AWS API model that includes the new field and/or remove it from a a list of ignored fields in generator.yaml. Since, this is a newer AWS feature you'll likely need to update the version of the AWS SDK used to generate the lambda-controller here to use a newer version of AWS Lambda's API model. If that results in additional fields being added that you don't want to take on in this PR you can add them to the ignored fields (see docs).

[knottnt]

If TenancyConfig can only be set on creation we may want to mark this field as immutable in generator.yaml. That way user's can get some feedback if they try to change it in an update.