adding scoped ea with vap ep demo

Signed-off-by: Jaydip Gabani <gabanijaydip@gmail.com>

demo/scoped-enforcement-actions/README.md

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+> [!WARNING]
+> This is a demo of an alpha feature and is subject to change.
+
+This demo shows:
+
+1. Configuring different validation actions for different enforcement points.
+2. Integration with VAP as enforcement point such that admission validation can be handled by [Kubernetes's in-process Validating Admission Policy Controller](https://kubernetes.io/docs/reference/access-authn-authz/validating-admission-policy/) instead of the Gatekeeper admission webhook. In the event the Validating Admission Policy Controller fails open, then Gatekeeper admission webhook can act as a fallback. This requires clusters with the Kubernetes Validating Admission Policy feature enabled.
+
+Please refer to <https://open-policy-agent.github.io/gatekeeper/website/docs/next/validating-admission-policy> for pre-requisites and configuration steps.
+
+## Demo
+
+<img width= "900" height="500" src="demo.gif" alt="vap demo">

demo/scoped-enforcement-actions/demo.sh

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+#!/bin/bash
+
+. ../../third_party/demo-magic/demo-magic.sh
+
+clear
+
+# cmd
+
+p "Deploy the constraint template"
+
+pe "kubectl apply -f k8srequiredlabels_template_usevap.yaml"
+
+p "View Constraint template to see the K8sNativeValidation engine and CEL rules are added"
+
+pe "cat k8srequiredlabels_template_usevap.yaml"
+
+pe "kubectl apply -f owner_must_be_provided.yaml"
+
+pe "cat owner_must_be_provided.yaml"
+
+p "Notice that only audit and validation is added as enforcement points and VAP as enforcement point is not added in the constraint"
+
+p "Let's test the policy"
+
+pe "kubectl create ns test"
+
+p "Note the namespace was blocked by the Gatekeeper webhook as evaluated by the CEL rules"
+
+p ""
+
+p "Now let's add the VAP as enforcement point and update the constraint"
+
+pe "kubectl apply -f owner_must_be_provided_usevap.yaml"
+
+pe "cat owner_must_be_provided_usevap.yaml"
+
+p "VAPBinding with validation aciton warn should get created automatically with inclusion of VAP as enforcement point with warn action since ConstraintTemplate has CEL and intent to use VAP"
+
+pe "kubectl get ValidatingAdmissionPolicy"
+
+pe "kubectl get ValidatingAdmissionPolicyBinding"
+
+p "Let's test the policy"
+
+pe "kubectl create ns test"
+
+p "Note the warning is generated by the ValidatingAdmissionPolicy admission controller and the namespace is blocked by the Gatekeeper webhook as evaluated by the CEL rules"
+
+p "THE END"
+
+kubectl delete constrainttemplates --all

demo/scoped-enforcement-actions/k8srequiredlabels_template_usevap.yaml

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+apiVersion: templates.gatekeeper.sh/v1
+kind: ConstraintTemplate
+metadata:
+  name: k8srequiredlabels
+spec:
+  crd:
+    spec:
+      names:
+        kind: K8sRequiredLabels
+      validation:
+        # Schema for the `parameters` field
+        openAPIV3Schema:
+          type: object
+          properties:
+            message:
+              type: string
+            labels:
+              type: array
+              items:
+                type: object
+                properties:
+                  key:
+                    type: string
+                  allowedRegex:
+                    type: string
+  targets:
+    - target: admission.k8s.gatekeeper.sh
+      code:
+        - engine: K8sNativeValidation
+          source:
+            generateVAP: true
+            validations:
+            - expression: '(has(variables.anyObject.metadata) && variables.params.labels.all(entry, has(variables.anyObject.metadata.labels) && entry.key in variables.anyObject.metadata.labels))'
+              messageExpression: '"missing required label, requires all of: " + variables.params.labels.map(entry, entry.key).join(", ")'
+            - expression: '(has(variables.anyObject.metadata) && variables.params.labels.all(entry, has(variables.anyObject.metadata.labels) && entry.key in variables.anyObject.metadata.labels && string(variables.anyObject.metadata.labels[entry.key]).matches(string(entry.allowedRegex))))'
+              message: "regex mismatch"

demo/scoped-enforcement-actions/owner_must_be_provided.yaml

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+apiVersion: constraints.gatekeeper.sh/v1beta1
+kind: K8sRequiredLabels
+metadata:
+  name: all-must-have-owner
+spec:
+  enforcementAction: scoped
+  scopedEnforcementActions:
+  - action: deny
+    enforcementPoints:
+    - name: validation.gatekeeper.sh
+    - name: audit.gatekeeper.sh
+  match:
+    kinds:
+      - apiGroups: [""]
+        kinds: ["Namespace"]
+  parameters:
+    message: "All namespaces must have an `owner` label that points to your company username"
+    labels:
+      - key: owner
+        allowedRegex: "^[a-zA-Z]+.agilebank.demo$"

demo/scoped-enforcement-actions/owner_must_be_provided_usevap.yaml

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+apiVersion: constraints.gatekeeper.sh/v1beta1
+kind: K8sRequiredLabels
+metadata:
+  name: all-must-have-owner
+spec:
+  enforcementAction: scoped
+  scopedEnforcementActions:
+  - action: deny
+    enforcementPoints:
+    - name: validation.gatekeeper.sh
+    - name: audit.gatekeeper.sh
+  - action: warn
+    enforcementPoints:
+    - name: vap.k8s.io
+  match:
+    kinds:
+      - apiGroups: [""]
+        kinds: ["Namespace"]
+  parameters:
+    message: "All namespaces must have an `owner` label that points to your company username"
+    labels:
+      - key: owner
+        allowedRegex: "^[a-zA-Z]+.agilebank.demo$"