fix(entrypoint): respect operator-provided P2P_ADVERTISE_IP

[faisalnugroho]

What

Makes the consensus-entrypoint script respect BASE_NODE_P2P_ADVERTISE_IP if the operator has already set it, instead of always running IP discovery and potentially overriding or failing.

The problem

The script unconditionally calls get_public_ip() (which tries ifconfig.me, api.ipify.org, ipecho.net, v4.ident.me) and exports the result as BASE_NODE_P2P_ADVERTISE_IP, even if the operator already configured this in their env file.

This causes two issues:

1. Silent override: If an operator sets BASE_NODE_P2P_ADVERTISE_IP to a specific value (e.g., a load balancer IP or a specific interface), the script ignores it and replaces it with whatever the discovery endpoints return.

2. Hard failure on restricted networks: If all four IP services are unreachable (firewalled host, restricted egress, transient network issues), the script exits with code 8 and the consensus container won't start — even when the operator already provided the correct IP.

The fix

if [[ -n "${BASE_NODE_P2P_ADVERTISE_IP:-}" ]]; then
  echo "Using operator-provided BASE_NODE_P2P_ADVERTISE_IP: $BASE_NODE_P2P_ADVERTISE_IP"
elif PUBLIC_IP=$(get_public_ip); then
  echo "fetched public IP is: $PUBLIC_IP"
  export BASE_NODE_P2P_ADVERTISE_IP=$PUBLIC_IP
else
  echo "Could not retrieve public IP."
  exit 8
fi

Discovery only runs as a fallback when no value is provided. Existing operators who don't set this variable see no behavior change — the script still discovers their IP automatically.

Fixes #1107

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[faisalnugroho]

Hi! I'd love to get this PR reviewed when you have a moment. This PR addresses respect operator-provided P2P_ADVERTISE_IP. Happy to make any adjustments based on your feedback. Let me know if there's anything I can do to help move this forward.