Temporary disabling arch build because of oom kill error

Author: OlivierCazade

.tekton/network-observability-console-plugin-1-8-push.yaml

@@ -29,8 +29,6 @@ spec:
   - name: build-platforms
     value:
     - linux/x86_64
-    - linux/ppc64le
-    - linux/s390x
   pipelineRef:
     name: build-pipeline
   taskRunTemplate: {}