Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/pingcap/docs-tidb-operator/blob/release-1.6/OWNERS)~~ [lilin90]
Approvers can indicate their approval by writing `/approve` in a comment
Approvers can cancel approval by writing `/approve cancel` in a comment
This is an automated cherry-pick of #2546
First-time contributors' checklist
What is changed, added, or deleted? (Required)
We can use Graviton instances in AWS
Which TiDB Operator version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?