support dynamic host port allocation for ChIP Config container

[Tofel]

Found one more startup failure in CI:

Error: failed to start Beholder: failed to create Chip Ingress set: failed to start stack for Chip Ingress: compose up: 
Error response from daemon: failed to set up container networking: driver failed programming external connectivity on endpoint chip-config (a07750e18994ea2174e2bf4d2b3e85d8b2b3379852ab626d72f8c42b4d495279): 
failed to bind host port for 0.0.0.0:50052:172.19.0.5:50051/tcp: address already in use

[github-actions]

👋 Tofel, thanks for creating this pull request!

To help reviewers, please consider creating future PRs as drafts first. This allows you to self-review and make any final changes before notifying the team.

Once you're ready, you can mark it as "Ready for review" to request feedback. Thanks!

[Copilot]

Pull request overview

This PR addresses CI flakiness caused by host-port collisions when starting the Chip Config container by switching the compose port mapping to dynamic host port allocation and updating the Go component to report the actual mapped external port.

Changes:

• Updated chip-config Docker Compose port mapping to use an ephemeral host port by default.
• Updated chip_ingress_set startup code to derive Chip Config’s external gRPC URL from either an env var override or the container’s mapped port.
• Added a dockercompose component changeset entry describing the change.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
framework/components/dockercompose/chip_ingress_set/docker-compose.yml	Switch chip-config host port mapping from fixed 50052 to dynamic allocation via env/default.
framework/components/dockercompose/chip_ingress_set/chip_ingress.go	Compute Chip Config external gRPC URL using mapped host port (or env override).
framework/components/dockercompose/.changeset/v0.1.23.md	Record the behavioral change in the component changeset.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.