Upgrade mysql image version to allow multi-arch env

[serut]

The Run a Single-Instance Stateful Application tutorial uses an old version of mysql that does not provide an ARM version of the image.

I've upgraded the version of the image used as this is as simple as that to make it work on newest macbook pro.

This is an effort of #45822

Without this :

➜  k8s kubectl describe pods -l app=mysql | grep image
  Normal   Pulling    3s    kubelet            Pulling image "mysql:5.6"
  Warning  Failed     1s    kubelet            Failed to pull image "mysql:5.6": no matching manifest for linux/arm64/v8 in the manifest list entries

With this :

➜  k8s kubectl describe pods -l app=mysql | grep image
  Normal  Pulling    70s   kubelet            Pulling image "mysql:9"
  Normal  Pulled     69s   kubelet            Successfully pulled image "mysql:9" in 1.059s (1.059s including waiting). Image size: 876227616 bytes.

The rest of the service declaration is fine:

➜  k8s kubectl get pods -l app=mysql
NAME                     READY   STATUS    RESTARTS      AGE
mysql-6c7c777b75-vr7lt   1/1     Running   0             29s

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[stmcginnis]

We typically only allow updating one language at a time. That said, this is not a language change, but a mechanical one. So, at least in my opinion, I think this is fine.

Good to update to a newer version anyway. Confirmed this version is a multiarch image:

crane manifest mysql:9 | jq '.manifests[].platform'

{
  "architecture": "amd64",
  "os": "linux"
}
{
  "architecture": "unknown",
  "os": "unknown"
}
{
  "architecture": "arm64",
  "os": "linux",
  "variant": "v8"
}
{
  "architecture": "unknown",
  "os": "unknown"
}

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 874726434d16fa66d335751ace7bb7a461331650