ci: Make the builds hermetic and build source (#215)

Author: pastequo

.tekton/cluster-api-provider-agent-mce-29-pull-request.yaml

@@ -34,6 +34,12 @@ spec:
     value: Dockerfile.rhtap
   - name: path-context
     value: .
+  - name: build-source-image
+    value: "true"
+  - name: hermetic
+    value: "true"
+  - name: prefetch-input
+    value: '{"type": "gomod", "path": "."}'
   pipelineSpec:
     description: |
       This pipeline is ideal for building multi-arch container images from a Containerfile while maintaining trust after pipeline customization.

.tekton/cluster-api-provider-agent-mce-29-push.yaml

@@ -31,6 +31,12 @@ spec:
     value: Dockerfile.rhtap
   - name: path-context
     value: .
+  - name: build-source-image
+    value: "true"
+  - name: hermetic
+    value: "true"
+  - name: prefetch-input
+    value: '{"type": "gomod", "path": "."}'
   pipelineSpec:
     description: |
       This pipeline is ideal for building multi-arch container images from a Containerfile while maintaining trust after pipeline customization.