Run etcd clusters inside containers

[DimShadoWWW]

Documentation page referers to latest tag and it is not recomended in #15382:

"If so, I would expect that the default etcd documentation does not prompt to use the latest tag (or state that this is not a good practice)."

"latest" tag can't be used Docker Image Format v1 and Docker Image manifest version 2

[jmhbnz]

Discussed during sig-etcd triage meeting, thanks for raising this @DimShadoWWW I agree we certainly should fix this.

The supported pages we should fix that all reference :latest are:

• https://etcd.io/docs/v3.4/op-guide/container/
• https://etcd.io/docs/v3.5/op-guide/container/
• https://etcd.io/docs/v3.6/op-guide/container/

We have an semi-automated process that updates other website pages with latest patch release tags so we can reuse that to update these pages also: https://github.com/etcd-io/website/blob/main/scripts/update_release_version.sh

[jverce]

/assign

[ivanvc]

Just to be clear, I think you can replace latest with {{< param git_version_tag >}}.