Update Dockerfile

[erigo]

Add MinIO Client for migrating data in each Milvus cluster.

[sre-ci-robot]

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[mergify]

@erigo Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/main/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[mergify]

@erigo Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

[wayblink]

@erigo Hi, Thanks for contribution. Why we need that?

[wayblink]

@erigo I get your point, good for now. We will support cross storage backup in our roadmap. Then you will not need to use mc client to copy to local. How about the image size change after you add mc client.

[erigo]

image size from 41.7MB to 68.2MB.

[wayblink]

@erigo Merged.