## What this PR does
The `vm-instance` chart now drives the cozy-proxy `wholeIP` and
`allowICMP` annotations explicitly so that `externalMethod: PortList`
actually filters ingress traffic to declared ports while keeping
ping/PMTU functional.
- Render `networking.cozystack.io/wholeIP: "false"` when
`externalMethod: PortList` (was always `"true"`, which silently disabled
the PortList semantics in cozy-proxy).
- Add `externalAllowICMP` value (default `true`) propagated as
`networking.cozystack.io/allowICMP` when `externalMethod: PortList`.
Without this, cozy-proxy drops ICMP in port-filter mode (ping/PMTU
broken). Operators can set `externalAllowICMP: false` to opt out.
The changelog entry is intentionally **not** part of this PR — it will
be added in a dedicated `docs: add changelog for vX.Y.Z` commit at
release time, per project convention.
## Why
`externalMethod: PortList` is documented as filtering ingress traffic to
declared ports but has been non-functional on Cozystack v1.3.0 —
verified empirically on a 3-node Talos lab. Root cause was twofold:
chart always set `wholeIP: "true"`, and cozy-proxy v0.2.0 had no
port-aware logic. The cozy-proxy side was fixed in
cozystack/cozy-proxy#11 (merged) and cozystack/cozy-proxy#12 (allowICMP
follow-up); this PR completes the user-visible fix on the chart side.
## Companion PRs
- cozystack/cozy-proxy#11 (merged) — per-service ingress port filtering
- cozystack/cozy-proxy#12 (merged) — `allowICMP` annotation for
port-filter mode
## Test plan
- [x] Built cozy-proxy with the companion fix locally, deployed on a
3-node Talos lab (Cozystack v1.3.0)
- [x] `wholeIP: "false"` Service with `spec.ports: [22]`: only port 22
reachable from outside; ports 80/443/8080/9999 filtered
- [x] WholeIP-annotated Service unchanged: all listening ports reachable
- [x] Egress IP preservation works in both modes (TCP curl + UDP DNS)
- [x] `nft list table ip cozy_proxy` confirms expected ruleset
- [x] `helm template` renders the expected annotation matrix: `PortList`
default → `wholeIP=false, allowICMP=true`; `PortList` opt-out →
`allowICMP=false`; `WholeIP` → only `wholeIP=true`
- [x] `make unit-tests` passes locally
- [ ] CI unit tests
- [ ] CI E2E
## Backport
Suggesting `backport-v1.3` once merged.
## Release note
```release-note
[vm-instance] Make `externalMethod: PortList` actually filter ingress traffic to ports listed in `externalPorts`. New `externalAllowICMP` knob (default true) propagates the cozy-proxy `allowICMP` annotation to keep ping/PMTU functional in port-filter mode. Combined with cozy-proxy v0.3.0+, only listed ports plus ICMP are reachable from the VM's LoadBalancer IP.
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added `externalAllowICMP` configuration option to control ICMP traffic
acceptance for VM external access in PortList mode (enabled by default).
* **Documentation**
* Updated parameter documentation to include the new ICMP traffic
control setting.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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