added arm64 in the list of platforms for trainer-huggingface

Author: tariq-hasan

.github/workflows/publish-core-images.yaml

@@ -34,4 +34,4 @@ jobs:
           - component-name: trainer-huggingface
             dockerfile: sdk/python/kubeflow/trainer/Dockerfile
             context: sdk/python/kubeflow/trainer
-            platforms: linux/amd64
+            platforms: linux/amd64,linux/arm64