feat(rule): add resolve references for targetgroups (#61)

Issue [#2641](aws-controllers-k8s/community#2641)

Description of changes:
Ensure we resolve references for elbv2
`rule.actions.forwardconfig.targetgroups`

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

Author: michaelhtm

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2025-09-25T18:46:28Z"
+  build_date: "2025-09-26T17:23:37Z"
   build_hash: 5bf1e456e1dfc638d47ab492376335f528c0f455
   go_version: go1.24.5
   version: v0.52.0-1-g5bf1e45
 api_directory_checksum: c0850c127b1c1c46a7abf233f454e1c7c561a71c
 api_version: v1alpha1
 aws_sdk_go_version: v1.32.6
 generator_config_info:
-  file_checksum: e59ecda70fd052399089af65a682c10fe45d58a5
+  file_checksum: d04b5f7d437623f4ddc566ea1f2e6b068125115e
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/generator.yaml

@@ -213,6 +213,10 @@ resources:
         references:
           resource: TargetGroup
           path: Status.ACKResourceMetadata.ARN
+      Actions.ForwardConfig.TargetGroups.TargetGroupARN:
+        references:
+          resource: TargetGroup
+          path: Status.ACKResourceMetadata.ARN
       Priority:
         set:
         - ignore: true

generator.yaml

@@ -213,6 +213,10 @@ resources:
         references:
           resource: TargetGroup
           path: Status.ACKResourceMetadata.ARN
+      Actions.ForwardConfig.TargetGroups.TargetGroupARN:
+        references:
+          resource: TargetGroup
+          path: Status.ACKResourceMetadata.ARN
       Priority:
         set:
         - ignore: true

pkg/resource/rule/references.go

@@ -6,8 +6,13 @@ spec:
   priority: 300
   listenerARN: $LISTENER_ARN
   actions:
-  - type: "forward"
-    targetGroupARN: $TARGET_GROUP_ARN
+    - forwardConfig:
+        targetGroups:
+          - targetGroupRef:
+              from:
+                name: $TARGET_GROUP_NAME
+            weight: 1
+      type: forward
   conditions:
   - field: http-request-method
     httpRequestMethodConfig:

test/e2e/resources/rule.yaml

@@ -45,7 +45,7 @@ def simple_rule(elbv2_client, simple_listener, simple_target_group, simple_load_
     replacements = REPLACEMENT_VALUES.copy()
     replacements["RULE_NAME"] = resource_name
     replacements["LISTENER_ARN"] = listener_cr["status"]["ackResourceMetadata"]["arn"]
-    replacements["TARGET_GROUP_ARN"] = target_group_cr["status"]["ackResourceMetadata"]["arn"]
+    replacements["TARGET_GROUP_NAME"] = target_group_cr["spec"]["name"]
 
     resource_data = load_elbv2_resource(
         "rule",