change the pull request pipeline definition from repo_urlto source_url (

#118)

Signed-off-by: clyang82 <[email protected]>

.tekton/maestro-pull-request.yaml

@@ -21,7 +21,7 @@ spec:
   - name: dockerfile
     value: Containerfile.rhtap
   - name: git-url
-    value: '{{repo_url}}'
+    value: '{{source_url}}'
   - name: image-expires-after
     value: 5d
   - name: output-image