Fix GitHub example bindings

The old bindings were for the GitHub push event while this EventListener is
configured for pull_request event types.  See:
https://developer.github.com/webhooks/event-payloads/#pull_request

docs/eventlisteners.md

@@ -341,9 +341,56 @@ spec:
         - cel:
             filter: "body.action in ['opened', 'synchronize', 'reopened']"
       bindings:
-        - ref: github-binding
+        - ref: github-pr-binding
       template:
         name: github-template
+---
+apiVersion: triggers.tekton.dev/v1alpha1
+kind: TriggerBinding
+metadata:
+  name: github-pr-binding
+spec:
+  params:
+    - name: gitrevision
+      value: $(body.pull_request.head.sha)
+    - name: gitrepositoryurl
+      value: $(body.repository.clone_url)
+
+---
+apiVersion: triggers.tekton.dev/v1alpha1
+kind: TriggerTemplate
+metadata:
+  name: github-template
+spec:
+  params:
+    - name: gitrevision
+    - name: gitrepositoryurl
+  resourcetemplates:
+    - apiVersion: tekton.dev/v1alpha1
+      kind: TaskRun
+      metadata:
+        generateName: github-run-
+      spec:
+        taskSpec:
+          inputs:
+            resources:
+              - name: source
+                type: git
+          steps:
+            - image: ubuntu
+              script: |
+                #! /bin/bash
+                ls -al $(inputs.resources.source.path)
+        inputs:
+          resources:
+            - name: source
+              resourceSpec:
+                type: git
+                params:
+                  - name: revision
+                    value: $(tt.params.gitrevision)
+                  - name: url
+                    value: $(tt.params.gitrepositoryurl)
 ```
 
 

examples/github/README.md

@@ -27,9 +27,9 @@ Creates an EventListener that listens for GitHub webhook events.
    ```bash
    curl -v \
    -H 'X-GitHub-Event: pull_request' \
-   -H 'X-Hub-Signature: sha1=13eaa0168f8d8efcdf5189ea75b782cf89809de6' \
+   -H 'X-Hub-Signature: sha1=ba0cdc263b3492a74b601d240c27efe81c4720cb' \
    -H 'Content-Type: application/json' \
-   -d '{"action": "opened", "head_commit":{"id":"master"},"repository":{"url": "https://github.com/tektoncd/triggers"}}' \
+   -d '{"action": "opened", "pull_request":{"head":{"sha": "28911bbb5a3e2ea034daf1f6be0a822d50e31e73"}},"repository":{"clone_url": "https://github.com/tektoncd/triggers.git"}}' \
    http://localhost:8080
    ```
 

examples/github/github-eventlistener-interceptor.yaml

@@ -17,6 +17,53 @@ spec:
         - cel:
             filter: "body.action in ['opened', 'synchronize', 'reopened']"
       bindings:
-        - ref: github-binding
+        - ref: github-pr-binding
       template:
         name: github-template
+---
+apiVersion: triggers.tekton.dev/v1alpha1
+kind: TriggerBinding
+metadata:
+  name: github-pr-binding
+spec:
+  params:
+    - name: gitrevision
+      value: $(body.pull_request.head.sha)
+    - name: gitrepositoryurl
+      value: $(body.repository.clone_url)
+
+---
+apiVersion: triggers.tekton.dev/v1alpha1
+kind: TriggerTemplate
+metadata:
+  name: github-template
+spec:
+  params:
+    - name: gitrevision
+    - name: gitrepositoryurl
+  resourcetemplates:
+    - apiVersion: tekton.dev/v1alpha1
+      kind: TaskRun
+      metadata:
+        generateName: github-run-
+      spec:
+        taskSpec:
+          inputs:
+            resources:
+              - name: source
+                type: git
+          steps:
+            - image: ubuntu
+              script: |
+                #! /bin/bash
+                ls -al $(inputs.resources.source.path)
+        inputs:
+          resources:
+            - name: source
+              resourceSpec:
+                type: git
+                params:
+                  - name: revision
+                    value: $(tt.params.gitrevision)
+                  - name: url
+                    value: $(tt.params.gitrepositoryurl)