Feature/image state update action (#49)

* addds triggerserive to monitor image updates example

Signed-off-by: Amit Singh <singhamitch@outlook.com>

* updates trigger action to optionally take pod env vars

Signed-off-by: Amit Singh <singhamitch@outlook.com>

* updates trigger action definition name

Signed-off-by: Amit Singh <singhamitch@outlook.com>

---------

Signed-off-by: Amit Singh <singhamitch@outlook.com>

config/definition/task.yaml

@@ -0,0 +1,103 @@
+apiVersion: core.oam.dev/v1alpha1
+kind: Definition
+metadata:
+  name: task
+  namespace: vela-system
+spec:
+  type: trigger-action
+  templates:
+    # create a Job resource as an action in the same namespace as the source (by default)
+    main.cue: |
+      import (
+        "vela/kube"
+      )
+
+      apply: kube.#Apply & {
+        $params: {
+          resource: {
+            apiVersion: "batch/v1"
+            kind: "Job"
+            metadata: {
+              name: parameter.name
+              namespace: parameter.namespace
+              if context.data.metadata.labels != _|_ {
+                labels: context.data.metadata.labels
+              }
+              ownerReferences: [
+                {
+                  apiVersion: context.data.apiVersion
+                  kind:       context.data.kind
+                  name:       context.data.metadata.name
+                  uid:        context.data.metadata.uid
+                  controller: true
+                },
+              ]
+            }
+
+            spec: {
+              if parameter.ttlSecondsAfterFinished != _|_ {
+                ttlSecondsAfterFinished: parameter.ttlSecondsAfterFinished
+              }
+
+              template: {
+                spec: {
+                  restartPolicy: parameter.restart
+                  containers: [{
+                    name: parameter.name
+                    image: parameter.image
+                    command: parameter.cmd
+
+                    if parameter.env == _|_ {
+                      env: [{
+                        name: "SOURCE_NAME"
+                        value: context.data.metadata.name
+                      },{
+                        name: "SOURCE_NAMESPACE"
+                        value: context.data.metadata.namespace
+                      }]
+                    }
+
+                    if parameter.env != _|_ {
+                      env: [{
+                        name: "SOURCE_NAME"
+                        value: context.data.metadata.name
+                      },{
+                        name: "SOURCE_NAMESPACE"
+                        value: context.data.metadata.namespace
+                      }] + parameter.env
+                    }
+                  }]
+                }
+              }
+            }
+          }
+        }
+      }
+
+      parameter: {
+        // +usage=The image to run the job container on
+        image: string
+
+        // +usage=Name of the cron job
+        name: *context.data.metadata.name | string
+
+        // +usage=The namespace to create the Job in
+        namespace: *context.data.metadata.namespace | string
+
+        // +usage=Define the job restart policy, the value can only be Never or OnFailure. By default, it's Never.
+        restart: *"Never" | string
+
+        // +usage=Number of seconds to wait before a successfully completed job is cleaned up
+        ttlSecondsAfterFinished?: uint
+
+        // +usage=Commands to run in the container
+        cmd: [...string]
+
+        // +usage=Define evironment variables for the Job container
+        env?: [...{
+          // +usage=Name of the environment variable
+          name: string
+          // +usage=Value of the environment variable
+          value: string
+        }]
+      }

examples/triggerservice-image-update.yaml

@@ -0,0 +1,28 @@
+apiVersion: standard.oam.dev/v1alpha1
+kind: TriggerService
+metadata:
+  name: image-rebase-trigger
+  namespace: default
+spec:
+  triggers:
+    - source:
+        # source is all the kpack Image resources in all the namespaces
+        type: resource-watcher
+        properties:
+          apiVersion: kpack.io/v1alpha2
+          # kpack needs to be installed on the cluster to have this resource type
+          kind: Image
+          events:
+            - update
+
+      # only trigger action when an Image is successfully rebased
+      filter: >
+        context.data.status.latestBuildReason == "STACK" && context.data.status.conditions[0].status == "True"
+      
+      action:
+        type: task
+        properties:
+          cmd: [/bin/sh, -c, "echo Image: ${SOURCE_NAME} in namespace: ${SOURCE_NAMESPACE} has been successfully rebased at $(date)"]
+          image: busybox
+          name: image-update-task
+          ttlSecondsAfterFinished: 600