Add bookworm linux/ppc64le variant to kube-cross

Author: Rajalakshmi-Girish

images/build/cross/cloudbuild.yaml

@@ -21,6 +21,7 @@ steps:
     - REVISION=$_REVISION
     - PROTOBUF_VERSION=$_PROTOBUF_VERSION
     - REGISTRY=$_REGISTRY
+    - PLATFORMS=$_PLATFORMS
     # default cloudbuild has HOME=/builder/home and docker buildx is in /root/.docker/cli-plugins/docker-buildx
     # set the home to /root explicitly to if using docker buildx
     - HOME=/root
@@ -45,6 +46,7 @@ substitutions:
   _REVISION: '0'
   _PROTOBUF_VERSION: '0.0.0'
   _REGISTRY: 'fake.repository/registry-name'
+  _PLATFORMS: 'linux/amd64 linux/arm64'
 
 tags:
 - 'kube-cross'

images/build/cross/variants.yaml

@@ -17,6 +17,16 @@ variants:
     GO_MAJOR_VERSION: '1.23'
     OS_CODENAME: 'bullseye'
     REVISION: '0'
+  v1.33-go1.23-bookworm:
+    CONFIG: 'go1.23-bookworm'
+    TYPE: 'default'
+    IMAGE_VERSION: 'v1.33.0-go1.23.6-bookworm.0'
+    KUBERNETES_VERSION: 'v1.33.0'
+    GO_VERSION: '1.23.6'
+    GO_MAJOR_VERSION: '1.23'
+    OS_CODENAME: 'bookworm'
+    REVISION: '0'
+    PLATFORMS: 'linux/ppc64le'
   v1.32-go1.23-bullseye:
     CONFIG: 'go1.23-bullseye'
     TYPE: 'default'