add host_stack_cidrs support in datapathv2

[l1b0k]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.80%. Comparing base (d0d421e) to head (7f4b3db).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/terway-cli/policy.go	70.00%	2 Missing and 1 partial ⚠️

❌ Your project status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #879      +/-   ##
==========================================
- Coverage   46.84%   46.80%   -0.04%     
==========================================
  Files         132      132              
  Lines       19513    19523      +10     
==========================================
- Hits         9140     9137       -3     
- Misses       9441     9451      +10     
- Partials      932      935       +3     

Flag	Coverage Δ
unittests	46.80% <70.00%> (-0.04%)	⬇️

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[Copilot]

Pull Request Overview

This PR implements support for multiple host stack CIDRs in Cilium's datapathv2 mode for the Terway CNI plugin. The implementation adds a new BPF map to handle multiple host stack CIDR ranges instead of relying on a single hardcoded IP address.

• Add new BPF map terway_host_stack_cidr with LPM trie structure for efficient CIDR lookups
• Implement host stack CIDR management functions in Go including map initialization and CIDR entry management
• Update configuration handling to support multiple host stack CIDRs via command line arguments and CNI configuration

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/kind/conf/*.cmdline	Add --terway-host-stack-cidr=169.254.20.10/32 parameter to test configuration files
policy/cilium/0014-feat-datapath-add-multi-host-stack-support-for-veth-.patch	Contains the main implementation patch with BPF map definition, daemon initialization logic, and configuration parsing
deploy/images/*/Dockerfile	Update Terway policy image reference to newer version with host stack CIDR support
cmd/terway-cli/policy.go	Add support for parsing host_stack_cidrs from CNI configuration and generating appropriate cilium arguments
cmd/terway-cli/policy_test.go	Add test cases for host stack CIDR configuration scenarios

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