add build sample for vulnerability scanning

samples/v1beta1/build/build_buildah_vulnerability_scanning_cr.yaml

@@ -0,0 +1,22 @@
+---
+apiVersion: shipwright.io/v1beta1
+kind: Build
+metadata:
+  name: buildah-golang-build
+spec:
+  source:
+    type: Git
+    git:
+      url: https://github.com/shipwright-io/sample-go
+    contextDir: docker-build
+  strategy:
+    name: buildah-shipwright-managed-push
+    kind: ClusterBuildStrategy
+  paramValues:
+  - name: dockerfile
+    value: Dockerfile
+  output:
+    image: image-registry.openshift-image-registry.svc:5000/build-examples/taxi-app
+    vulnerabilityScan:
+      enabled: true
+      fail: false # if set to true, then the image won't be pushed to the registry