[stable/minio] Fix minio cannot create bucket (#5658)

Running `helm install --set "accessKey=$minioaccesskey,secretKey=$miniosecretaccesskey,defaultBucket.enabled=true,defaultBucket.name=$minio_bucket_name,defaultBucket.purge=true" ./minio`
was failing with a `can't open '/config/initialize'` error message.

The `/config/initialize` script is the entrypoint for the
`post-install-create-bucket-job`. The `initialize` script comes from the
`minio` configmap. This `configmap` was deleted in
https://github.com/kubernetes/charts/pull/4277, because it also included
the `config.json`. Mounting the `config.json` was causing issues with
`minio` because Kubernetes switched to having all `ConfigMap` mounts be
readonly.

However, there is no issue with the `/config/initialize` script being
read only, so I added back the `configmap` with just the `initialize`
data.

I verified that the above `helm install` command works does not result
in a crash loop.

stable/minio/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: Distributed object storage server built for cloud applications and devops.
 name: minio
-version: 1.3.2
+version: 1.3.3
 appVersion: RELEASE.2018-04-27T23-33-52Z
 keywords:
 - storage

stable/minio/templates/configmap.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "minio.fullname" . }}
+  labels:
+    app: {{ template "minio.name" . }}
+    chart: {{ template "minio.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+data:
+  initialize: |-
+{{ include (print $.Template.BasePath "/_helper_create_bucket.txt") . | indent 4 }}

stable/minio/templates/post-install-create-bucket-job.yaml

@@ -27,6 +27,8 @@ spec:
         - name: minio-configuration
           projected:
             sources:
+            - configMap:
+                name: {{ template "minio.fullname" . }}
             - secret:
                 name: {{ template "minio.fullname" . }}
       containers: