Velero: Document v1.5 upgrade steps

[nrb]

For v1.5, we'll need upgrade steps

Known steps so far:

• Upgrade CRDs for #2674 to work. In particular, we need the new validationFrequency fields and updates to the status subresource
• Upgrade images

[nrb]

Thanks @phuongatemc for pointing out that this documentation wasn't immediately obvious!

[ashish-amarnath]

CRD update also required for https://github.com/vmware-tanzu/velero/pull/2611 that adds the defaultVolumesToRestic field to the backup CRD spec.

[ashish-amarnath]

Document new label on volumesnapshotclass introduced in https://github.com/vmware-tanzu/velero-plugin-for-csi/pull/60

[tlvenn]

Out of curiosity, is there a timeframe for the 1.5 release ? I am particularly interested with the restic opt-out strategy and it would be great to try it out. Thanks.

[carlisia]

Out of curiosity, is there a timeframe for the 1.5 release ? I am particularly interested with the restic opt-out strategy and it would be great to try it out. Thanks.

@tlvenn end of August is what we are aiming for.

[tlvenn]

Thanks, just noticed that there was actually a date on the milestone, sorry about the noise.

[carlisia]

Adding anote here to remember to update Helm with the new CRDs. I can do this.

[ashish-amarnath]

Helm chart also need to be updated to pass the --default-volumes-to-restic flag to the deployment