feat: add chart hooks to migration-job template for app chart (#36)

* chore: add .idea folder to .gitignore

* feat: add chart hooks to migration-job template

* feat: bump up app chart version

* feat: change hook delete policy for migration job

Author: bsushmith

.gitignore

@@ -13,3 +13,4 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+.idea/

stable/app/templates/migration-job.yaml

@@ -10,7 +10,12 @@ spec:
     metadata:
       {{- with .Values.podAnnotations }}
       annotations:
-        {{- toYaml . | nindent 8 }}
+      # This is what defines this resource as a hook. Without this line, the
+      # job is considered part of the release.
+      "helm.sh/hook": pre-install
+      "helm.sh/hook-weight": "-5"
+      "helm.sh/hook-delete-policy": hook-succeeded,hook-failed
+      {{- toYaml . | nindent 8 }}
       {{- end }}
       labels:
         {{- include "app.selectorLabels" . | nindent 8 }}