deploy, manifests: enable cloud storage volume expansion & label local volume

[tennix]

What problem does this PR solve?

What is changed and how does it work?

Cloud storage volume expansion is enabled by default. Hostname label will be attached to local PV.

Check List

Tests

• Manual test
  1. Cloud provider storage class allowVolumeExpansion attribute can be updated in-place by kubectl edit sc ebs-gp2 to add allowVolumeExpansion: true
  2. After adding allowVolumeExpansion: true, updating PVC with larger storage size, the corresponding PV will be expanded to the desired size.
  3. The storage class reclaimPolicy can not be changed dynamically. So old gke persistent disk storage class cannot migrate to Retain.

Code changes

• Has volume setup change

Side effects

None

Related changes

• Need to cherry-pick to the release-1.0 branch
• Need to update the documentation

Does this PR introduce a user-facing change?:

Users can now expand cloud storage PV dynamically by increasing PVC storage size.

[CLAassistant]

All committers have signed the CLA.

[weekface]

/run-e2e-in-kind

[aylei]

LGTM
BTW, I suppose we should document the extra works if the user want to expand the volume size of PVCs managed by StatefulSet.

[gregwebs]

The storage class reclaimPolicy can not be changed dynamically. So old gke persistent disk storage class cannot migrate to Retain

Currently we migrate from Retain to Delete. Can we still do this?

[tennix]

The storage class reclaimPolicy can not be changed dynamically. So old gke persistent disk storage class cannot migrate to Retain

Currently we migrate from Retain to Delete. Can we still do this?

No, but for tidb-operator managed PVC, the reclaim policy was reset to Retain by default no matter what is the storage class's default reclaim policy. And the existing PV can be patched to use Retain.

[cofyc]

LGTM

[tennix]

LGTM
BTW, I suppose we should document the extra works if the user want to expand the volume size of PVCs managed by StatefulSet.

I'll send a PR to add the document to docs and docs-cn later.

[sre-bot]

cherry pick to release-1.0 in PR #781