Set a restic tag in a BackupConfiguration

[zonca]

I deployed stash to backup persistent volumes with restic, is there a way to set a restic tag for each backupconfiguration?

Now if I access my backups via restic command line tool, I see:

ID        Time                 Host        Tags        Paths
------------------------------------------------------------------
17b32c09  2021-05-16 01:40:15  host-0                  /stash-data
f1c25a84  2021-05-19 01:30:20  host-0                  /stash-data
af54e5da  2021-05-19 01:40:16  host-0                  /stash-data
5954b64c  2021-05-20 01:10:31  host-0                  /stash-data
08f01220  2021-05-20 01:20:20  host-0                  /stash-data
c15f4f0c  2021-05-20 01:30:25  host-0                  /stash-data
23cb311a  2021-05-20 01:40:09  host-0                  /stash-data
------------------------------------------------------------------

It would be nice if I can specify a tag so I know which user owns which volume even outside of stash.

In case it is useful, my backupconfiguration:

apiVersion: stash.appscode.com/v1beta1
kind: BackupConfiguration
metadata:
  name: test-backup
  namespace: jhub
spec:
  driver: Restic
  repository:
    name: osn-repo
  task:
    name: pvc-backup
  schedule: "* * * * *"
  paused: false
  backupHistoryLimit: 3
  runtimeSettings:
    container:
      securityContext:
        runAsUser: 1000
  target:
    exclude:
    - /stash-data/lost+found
    ref:
      apiVersion: v1
      kind: PersistentVolumeClaim
      name: claim-zonca
  retentionPolicy:
    name: 'keep-last-5-zonca'
    keepLast: 5
    prune: true

[hossainemruz]

@zonca We have decided to introduce a generic option to pass user arguments to the restic backup/restore command. Check this PR: stashed/apimachinery#121

Now, you can pass any flags (including --tag) to the restic backup/restore command. Please see the example here: #1384