Add e2e test for image automation

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

tests/image-automation/kustomization.yaml

@@ -0,0 +1,10 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: flux-system
+resources:
+  - https://raw.githubusercontent.com/stefanprodan/podinfo/5.2.0/kustomize/deployment.yaml
+  - auto.yaml
+images:
+  - name: ghcr.io/stefanprodan/podinfo
+    newName: ghcr.io/stefanprodan/podinfo
+    newTag: 5.2.0 # {"$imagepolicy": "flux-system:podinfo:tag"}