Update network-observability-console-plugin-1-8-push.yaml

Author: OlivierCazade

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

@@ -25,6 +25,11 @@ spec:
     value: quay.io/redhat-user-workloads/ocp-network-observab-tenant/netobserv-operator/network-observability-console-plugin:{{revision}}
   - name: dockerfile
     value: Dockerfile.downstream
+  - name: build-platforms
+    value:
+    - linux/x86_64
+    - linux/ppc64le
+    - linux/s390x
   pipelineRef:
     name: build-pipeline
   taskRunTemplate: {}