feat (molgenis-vault): Switch backup storage to s3.

We can host s3 compatible storage locally by deploying the stable/minio chart.
Ran into https://github.com/coreos/etcd-operator/issues/1980 and therefore downgrade the backup and restore operator images to 0.8.3.

molgenis-vault/README.md

@@ -16,11 +16,12 @@ See https://github.com/coreos/vault-operator/blob/master/doc/user/vault.md
 Define credentials for backup to the Azure Blob Store.
 See [etcd-operator documentation](https://github.com/coreos/etcd-operator/blob/master/doc/user/abs_backup.md).
 
-| Parameter       | Description                   | Default            |
-| --------------- | ----------------------------- | ------------------ |
-| `abs.account`   | name of storage account       | `fdlkops`          |
-| `abs.accessKey` | access key of storage account | `xxxx`             |
-| `abs.cloud`     | name of cloud environment     | `AzurePublicCloud` |
+| Parameter            | Description                          | Default                                    |
+| -------------------- | ------------------------------------ | ------------------------------------------ |
+| `s3.accessKeyId`     | key id storage account               | `AKIAIOSFODNN7EXAMPLE`                     |
+| `s3.secretAccessKey` | secret access key of storage account | `wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY` |
+| `s3.region`          | region of the storage server         | `us-east-1`                                |
+| `s3.endpoint`        | endpoint for the storage server      | `http://minio.minio.svc:9000`              |
 
 ### Backup job
 Define the schedule of the backup job