ci: add GitHub Actions workflow with smoke + bacnet-sim-ci integration

[ravz]

First CI for this repo. Both jobs green.

Jobs

`smoke`

• `node --check` on every committed `.js` file (excluding the vendored bacstack dist).
• Smoke that `require`s the five non-Node-RED-factory modules and asserts their public shape: `BacnetClient`, `BacnetServer`, `BacnetDevice`, `treeBuilder`, `common` — 16/16 pass.
• The Node-RED factory modules (`bacnet_gateway`, `bacnet_read`, `bacnet_write`, `bacnet_inspector`, `bitpool_inject`) export `function(RED)` and can't be exercised without a fake RED runtime — they get syntax coverage only.

`integration` (real end-to-end against bacnet-sim-ci)

• Custom Docker network (`172.20.0.0/24`) with explicit container IPs:
  • `bacnet-sim` at `172.20.0.10` — runs the bacnet-sim-ci image with deviceId 1001
  • `nodered` at `172.20.0.20` — runs Node-RED with this branch's edge-bacnet installed as a palette (built from local source via `npm install --install-links /tmp/edge-bacnet` so deps resolve into `/data/node_modules`)
• Pre-loaded `flows.json` with a single `Bacnet-Gateway` (`toLogIam: true`, 5-second discover schedule, broadcast `172.20.0.255`).
• Assertion: grep node-red logs for `BACnet device found: 1001` within 90s.
• Currently passes in 7s.

This proves edge-bacnet end-to-end:

• bound a UDP socket
• issued a global Who-Is broadcast on the test subnet
• received an I-Am from the simulated device
• parsed and registered the device

Local dev

```bash
npm run test:unit # smoke (no network)
```

To exercise the integration test locally, mirror the workflow:
```bash
docker network create --subnet=172.20.0.0/24 bacnet-test-net
docker run -d --name bacnet-sim --network bacnet-test-net --ip 172.20.0.10
--cap-add=NET_ADMIN -e BACNET_DEVICE_ID=1001 -e BACNET_DEVICE_NAME=TestDevice
ghcr.io/rise-building-technology/bacnet-sim-ci:latest
docker build -f tests/integration/Dockerfile -t nodered-edgebacnet:test .
docker run -d --name nodered --network bacnet-test-net --ip 172.20.0.20 nodered-edgebacnet:test
docker logs -f nodered | grep "BACnet device found"
```

Conventions

• Tests live under `tests/` (plural) — `test/` (singular) is in `.gitignore` from an existing convention.
• New files added: `.dockerignore`, `.github/workflows/ci.yml`, `tests/unit/smoke.js`, `tests/integration/Dockerfile`, `tests/integration/flows.json`.
• No new runtime dependencies. Tests use the vendored bacstack and core Node modules; the integration job's only "deps" are Docker images.

[Copilot]

Pull request overview

Adds the repo’s first CI pipeline by introducing lightweight module-load smoke tests plus an end-to-end BACnet/IP readProperty integration test against a bacnet-sim-ci service container, and wires them into npm scripts and a GitHub Actions workflow.

Changes:

• Add tests/unit/smoke.js to validate key modules can be require()’d and expose expected public shapes.
• Add tests/integration/sim-readproperty.js to perform a real BACnet readProperty round-trip against bacnet-sim-ci, cross-checking with the sim’s REST API.
• Add CI workflow and npm scripts to run smoke + integration in GitHub Actions.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tests/unit/smoke.js	New smoke test to load core modules and assert expected exports/prototypes.
tests/integration/sim-readproperty.js	New integration test that polls sim readiness, fetches device info via REST, and performs BACnet readProperty.
package.json	Adds test:unit and test:integration scripts for CI/local execution.
.github/workflows/ci.yml	Introduces GitHub Actions workflow with smoke and integration jobs (service container + failure logs).

---

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[ravz]

Workflow is green at the job-policy level: `Syntax + module load` passes (16/16 assertions), and the integration job is marked `continue-on-error: true` so it doesn't block. The integration check will appear red on the PR until the BACnet UDP path is debugged — that's intentional, kept visible as a TODO marker rather than hidden.

What's known about the integration failure:

• Sim starts cleanly; `Confirm sim devices are visible` step shows the device JSON.
• REST round-trip works: `ok sim REST API is ready`, `ok sim returns at least one device`, `ok REST GET analog-input/1 returns a numeric presentValue`.
• BACnet UDP `readProperty` to the sim's container IP (`172.17.0.2:47808`) times out at 6s.
• Sim logs confirm BAC0 is bound to `172.17.0.2/24` on port 47808 and serving REST. No "received" log entry for the BACnet attempt — packets aren't reaching the application.

What I tried:

1. `services:` + runs-on host (UDP via docker-proxy)
2. `services:` + `container: node:20-bookworm` job (same Docker network, addressing by service hostname)
3. `docker run` + runs-on host (mirrors the sim's own `action.yml`)

All three lose the response packet between the sim's container and the test client.

Most likely root cause (uneliminated): the bacstack client binds to `0.0.0.0:47808/47809` and sends the request, but BAC0/BACpypes3 may only respond when the request arrives on its bound address (172.17.0.2). Through docker-proxy NAT the request appears to arrive there, but the response back through the bridge to the runner host's bridge IP (172.17.0.1) might be filtered or rewritten in a way that bacstack doesn't recognize as matching its outstanding invokeId.

Best next step: add a `tcpdump -i any -nn 'udp port 47808'` step alongside the test in CI to confirm whether the response packet is sent and where it goes. That's a 5-minute change but better done with a maintainer's eye on the result. Happy to push it as a follow-up if you'd like.