Update set-pipeline example

The first job should update the pipeline that the job belongs to. If
this doesn't happen then any changes to the pipeline won't take affect
until a second build is triggered

Signed-off-by: Taylor Silva <tsilva@pivotal.io>

pipelines/set-pipelines.yml

@@ -7,13 +7,20 @@ resources:
       uri: https://github.com/concourse/examples
 
 jobs:
-  - name: set-example-pipelines
+  # update this pipeline before updating child pipelines
+  - name: set-self
     public: true
     plan:
       - get: concourse-examples
         trigger: true
       - set_pipeline: set-pipelines
         file: concourse-examples/pipelines/set-pipelines.yml
+  - name: set-example-pipelines
+    public: true
+    plan:
+      - get: concourse-examples
+        trigger: true
+        passed: [set-self]
       - set_pipeline: job
         file: concourse-examples/pipelines/hello-world.yml
       - set_pipeline: separate-task-config