docs(platform-package): note the /21 the kube-ovn variants keep for cilium

[europrinter (yankawai)]

What this PR does

follow-up for cozystack/cozystack#4778. that pr moves the router and gateway api ingress addresses of cilium on the kube-ovn variants into the last /21 of networking.podCIDR and excludes that block from kube-ovn, so the pod cidr has to be /20 or wider there. each node takes a /29 of that block, which caps these variants at 256 nodes. the networking.podCIDR row in the next platform package reference now says both. nothing for the released versions, the change is on main only.

• bash hack/check-i18n.sh check passes, 29 keys and 20 translated pages.
• git diff --check is clean, one reference file changes.
• hugo was not built locally.

merge it together with cozystack/cozystack#4778.

Screenshots

not applicable, reference documentation only.

Downstream repositories

• No downstream repository is affected by this change
• cozystack/website - follow-up:
• cozystack/terraform-provider-cozystack - follow-up:
• cozystack/ansible-cozystack - follow-up:
• cozystack/ccp - follow-up:
• cozystack/talm - follow-up:
• cozystack/cozyhr - follow-up:
• cozystack/cozy-proxy - follow-up:
• cozystack/cozystack-telemetry-server - follow-up:
• cozystack/external-apps-example - follow-up:
• cozystack/examples - follow-up:
• cozystack/community - follow-up:

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[Aleksei Sviridkin (lexfrei)]

europrinter (@yankawai) one thing to add before this goes in. The row matches cozystack/cozystack#4778 as it stands now: the last /21 goes to Cilium's router and Ingress addresses, kube-ovn excludes it, and the render needs /20 or shorter. The 256-node ceiling is missing, though. Since the last push of #4778, the networking.podCIDR comment in values.yaml and its release note both say that a /21 of /29s caps these variants at 256 nodes, and a fresh install hits that too. This row is where an operator looks for the constraints on podCIDR, so please add the same sentence here.

The change only touches next/, which is right while #4778 is unmerged.

[europrinter (yankawai)]

Aleksei Sviridkin (@lexfrei) added. the row now says each node takes a /29 of that /21, which caps these variants at 256 nodes, same as the networking.podCIDR comment and the release note in cozystack/cozystack#4778. amended into the one commit, 56a6830, and hack/check-i18n.sh check still passes.

[Aleksei Sviridkin (lexfrei)]

europrinter (@yankawai) the 256-node ceiling is in now and the row matches #4778 at its current head. LGTM; this should land together with or after #4778.