tests: add chainsaw test for image data loading (#12077)

Signed-off-by: Charles-Edouard Brétéché <charles.edouard@nirmata.com>

test/conformance/chainsaw/validating-policies/context/image-data/chainsaw-test.yaml

@@ -0,0 +1,17 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/kyverno/chainsaw/main/.schemas/json/test-chainsaw-v1alpha1.json
+apiVersion: chainsaw.kyverno.io/v1alpha1
+kind: Test
+metadata:
+  name: image-data
+spec:
+  steps:
+  - name: create policy
+    try:
+    - create:
+        file: policy.yaml
+    - sleep:
+        duration: 10s
+  - name: create deployment
+    try:
+    - create:
+        file: deployment.yaml

test/conformance/chainsaw/validating-policies/context/image-data/deployment.yaml

@@ -0,0 +1,19 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:latest

test/conformance/chainsaw/validating-policies/context/image-data/policy.yaml

@@ -0,0 +1,23 @@
+apiVersion: kyverno.io/v2alpha1
+kind: ValidatingPolicy
+metadata:
+  name: check-deployment-labels
+spec:
+  matchConstraints:
+    resourceRules:
+    - apiGroups:   [apps]
+      apiVersions: [v1]
+      operations:  [CREATE, UPDATE]
+      resources:   [deployments]
+  variables:
+    - name: image
+      expression: >-
+        context.GetImageData("ghcr.io/kyverno/kyverno:latest")
+    - name: accept
+      expression: >-
+        variables.image != null
+  validations:
+    - expression: >-
+        variables.accept
+      message: >-
+        Deployment must be accepted