Add Pre/PostSync job example

pre-post-sync/components/guestbook-ui.jsonnet

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+local env = std.extVar("__ksonnet/environments");
+local params = std.extVar("__ksonnet/params").components["guestbook-ui"];
+[
+   {
+      "apiVersion": "v1",
+      "kind": "Service",
+      "metadata": {
+         "name": params.name
+      },
+      "spec": {
+         "ports": [
+            {
+               "port": params.servicePort,
+               "targetPort": params.containerPort
+            }
+         ],
+         "selector": {
+            "app": params.name
+         },
+         "type": params.type
+      }
+   },
+   {
+      "apiVersion": "apps/v1beta2",
+      "kind": "Deployment",
+      "metadata": {
+         "name": params.name
+      },
+      "spec": {
+         "replicas": params.replicas,
+         "selector": {
+            "matchLabels": {
+               "app": params.name
+            },
+         },
+         "template": {
+            "metadata": {
+               "labels": {
+                  "app": params.name
+               }
+            },
+            "spec": {
+               "containers": [
+                  {
+                    "image": params.image,
+                    "name": params.name,
+                    "ports": [
+                        {
+                            "containerPort": params.containerPort
+                        }
+                    ],
+                    // dummy readiness probe to slow down the rollout for demo/testing
+                    "readinessProbe": {
+                        "exec": {
+                            "command": [ "sh", "-c", "exit 0" ],
+                        },
+                        "initialDelaySeconds": 30,
+                        "periodSeconds": 120,
+                    }
+                  }
+               ]
+            }
+         }
+      }
+   }
+]

pre-post-sync/components/params.libsonnet

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+{
+  global: {
+    // User-defined global parameters; accessible to all component and environments, Ex:
+    // replicas: 4,
+  },
+  components: {
+    // Component-level parameters, defined initially from 'ks prototype use ...'
+    // Each object below should correspond to a component in the components/ directory
+    "guestbook-ui": {
+      containerPort: 80,
+      image: "gcr.io/heptio-images/ks-guestbook-demo:0.1",
+      name: "pre-post-sync",
+      replicas: 1,
+      servicePort: 80,
+      type: "LoadBalancer",
+    },
+    "pre-sync-job": {},
+    "post-sync-job": {},
+  },
+}

pre-post-sync/components/post-sync-job.yaml

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+apiVersion: batch/v1
+kind: Job
+metadata:
+  generateName: after-
+  annotations:
+    argocd.argoproj.io/hook: PostSync
+spec:
+  template:
+    spec:
+      containers:
+      - name: sleep
+        image: alpine:latest
+        command: ["sleep", "30"]
+      restartPolicy: Never
+  backoffLimit: 4

pre-post-sync/components/pre-sync-job.yaml

@@ -0,0 +1,15 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  generateName: before-
+  annotations:
+    argocd.argoproj.io/hook: PreSync
+spec:
+  template:
+    spec:
+      containers:
+      - name: sleep
+        image: alpine:latest
+        command: ["sleep", "30"]
+      restartPolicy: Never
+  backoffLimit: 4