Add Example for NamespacedInterceptor

Example utilizes Core Interceptor from v0.19 Triggers.

examples/v1alpha1/namespacedinterceptor/README.md

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+## NamespacedInterceptor
+
+Creates a NamespacedInterceptor and an EventListener which utilizes this Interceptor.
+
+### Try it out locally:
+
+1. To create the NamespacedInterceptor and all related resources, run:
+
+   ```bash
+   kubectl apply -f .
+   ```
+
+1. Port forward:
+
+   ```bash
+   kubectl port-forward service/el-example-interceptor-cel 8080 &
+   ```
+
+1. Test by sending the sample payload.
+
+   ```bash
+   curl -k -v     -H 'X-GitHub-Event: pull_request'     -H 'X-Hub-Signature: sha1=8d7c4d33686fd908394208a07d997b8f5bd70aa6'     -H 'Content-Type: application/json'     -d '{"head_commit":{"id":"28911bbb5a3e2ea034daf1f6be0a822d50e31e73"},"action": "opened", "pull_request":{"head":{"sha": "28911bbb5a3e2ea034daf1f6be0a822d50e31e73"}},"repository":{"clone_url": "https://github.com/tektoncd/triggers.git", "url":"https://github.com/tektoncd/triggers.git"}}'     http://localhost:8080
+   ```
+
+   The response status code should be `202 Accepted`
+
+
+1. You should see a new TaskRun that got created:
+
+   ```bash
+   kubectl get taskruns | grep example-interceptor-run-
+   ```

examples/v1alpha1/namespacedinterceptor/eventlistener.yaml

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+apiVersion: triggers.tekton.dev/v1alpha1
+kind: EventListener
+metadata:
+  name: example-interceptor-cel
+spec:
+  serviceAccountName: tekton-triggers-example-sa
+  triggers:
+    - name: cel-trig
+      interceptors:
+        - ref:
+            name: "example-interceptor-cel"
+            kind: NamespacedInterceptor
+          params:
+            - name: "filter"
+              value: "header.match('X-GitHub-Event', 'pull_request')"
+      bindings:
+        - name: gitrevision
+          value: $(body.head_commit.id)
+        - name: gitrepositoryurl
+          value: $(body.repository.url)
+      template:
+        spec:
+          params:
+            - name: gitrevision
+            - name: gitrepositoryurl
+          resourcetemplates:
+            - apiVersion: tekton.dev/v1beta1
+              kind: TaskRun
+              metadata:
+                generateName: example-interceptor-run-
+              spec:
+                taskSpec:
+                  steps:
+                    - image: ubuntu
+                      script: |
+                        #! /bin/bash
+                        echo "Revision is : $(tt.params.gitrevision). RepoURL is $(tt.params.gitrepositoryurl)"

examples/v1alpha1/namespacedinterceptor/interceptors-deployment.yaml

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+# Copyright 2022 The Tekton Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: example-interceptor-cel
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: example-interceptor-cel
+subjects:
+  - kind: ServiceAccount
+    name: example-interceptor-cel
+    namespace: default
+roleRef:
+  kind: ClusterRole
+  name: example-interceptor-cel
+  apiGroup: rbac.authorization.k8s.io
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: example-interceptor-cel-secrets
+subjects:
+  - kind: ServiceAccount
+    name: example-interceptor-cel
+    namespace: default
+roleRef:
+  kind: ClusterRole
+  name: example-interceptor-cel-secrets
+  apiGroup: rbac.authorization.k8s.io
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: example-interceptor-cel
+  namespace: default
+subjects:
+  - kind: ServiceAccount
+    name: example-interceptor-cel
+    namespace: default
+roleRef:
+  kind: Role
+  name: example-interceptor-cel
+  apiGroup: rbac.authorization.k8s.io
+---
+kind: Role
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: example-interceptor-cel
+  namespace: default
+rules:
+  - apiGroups: [""]
+    resources: ["configmaps"]
+    verbs: ["get", "list", "watch"]
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: example-interceptor-cel
+rules:
+  - apiGroups: [""]
+    resources: ["secrets"]
+    verbs: ["get", "list", "watch"]
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: example-interceptor-cel-secrets
+rules:
+  - apiGroups: ["triggers.tekton.dev"]
+    resources: ["clusterinterceptors"]
+    verbs: ["get", "list", "watch", "update"]
+  - apiGroups: [""]
+    resources: ["secrets"]
+    verbs: ["get", "list", "watch", "update"]
+    resourceNames: ["example-interceptor-cel-certs"]
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app.kubernetes.io/component: example-interceptor-cel
+  name: example-interceptor-cel
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/component: example-interceptor-cel
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/component: example-interceptor-cel
+    spec:
+      containers:
+      - args:
+        - -logtostderr
+        - -stderrthreshold
+        - INFO
+        env:
+        - name: SYSTEM_NAMESPACE
+          valueFrom:
+            fieldRef:
+              apiVersion: v1
+              fieldPath: metadata.namespace
+        image: "gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/interceptors:v0.19.0@sha256:69fb65c702c74d086851b4c9852bd63b057b08fa5f8d54ddd1c0585e5f66dec1"
+        imagePullPolicy: IfNotPresent
+        name: example-interceptor-cel
+        readinessProbe:
+          failureThreshold: 3
+          httpGet:
+            path: /ready
+            port: 8082
+            scheme: HTTP
+          initialDelaySeconds: 5
+          periodSeconds: 10
+          successThreshold: 1
+          timeoutSeconds: 5
+        securityContext:
+          allowPrivilegeEscalation: false
+          capabilities:
+            drop:
+            - ALL
+          runAsGroup: 65532
+          runAsNonRoot: true
+          runAsUser: 65532
+          seccompProfile:
+            type: RuntimeDefault
+        terminationMessagePath: /dev/termination-log
+        terminationMessagePolicy: File
+      dnsPolicy: ClusterFirst
+      restartPolicy: Always
+      schedulerName: default-scheduler
+      serviceAccount: example-interceptor-cel
+      serviceAccountName: example-interceptor-cel
+      terminationGracePeriodSeconds: 30
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: example-interceptor-cel
+spec:
+  ports:
+    - name: "http"
+      port: 8082
+      targetPort: 8082
+  selector:
+    app.kubernetes.io/component: example-interceptor-cel

examples/v1alpha1/namespacedinterceptor/interceptors.yaml

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+# Copyright 2021 The Tekton Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: triggers.tekton.dev/v1alpha1
+kind: Interceptor
+metadata:
+  name: example-interceptor-cel
+spec:
+  clientConfig:
+    service:
+      name: example-interceptor-cel
+      namespace: default
+      path: cel
+      port: 8082

examples/v1alpha1/namespacedinterceptor/rbac.yaml

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+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: tekton-triggers-example-sa
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: triggers-example-eventlistener-binding
+subjects:
+- kind: ServiceAccount
+  name: tekton-triggers-example-sa
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: tekton-triggers-eventlistener-roles
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: triggers-example-eventlistener-clusterbinding
+subjects:
+- kind: ServiceAccount
+  name: tekton-triggers-example-sa
+  namespace: default
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: tekton-triggers-eventlistener-clusterroles