Attempt hermetic and multiarch

Signed-off-by: Alex Fan <91211463+alexxfan@users.noreply.github.com>

Author: alexxfan

.tekton/odh-trainer-poc-push.yaml

@@ -28,6 +28,17 @@ spec:
     value: cmd/trainer-controller-manager/Dockerfile.rhoai
   - name: path-context
     value: .
+  - name: prefetch-input
+    value: |
+      {"type": "gomod", "path": "."}
+  - name: build-platforms
+    value:
+    - linux/x86_64
+    - linux/ppc64le
+    - linux/s390x
+    - linux-m2xlarge/arm64
+  - name: hermetic
+    value: true
   pipelineSpec:
     description: |
       This pipeline is ideal for building container images from a Containerfile while maintaining trust after pipeline customization.
@@ -63,7 +74,7 @@ spec:
       description: Skip checks against built image
       name: skip-checks
       type: string
-    - default: "false"
+    - default: "true"
       description: Execute the build with network isolation
       name: hermetic
       type: string