test: let the suite address a regtest stack that is not on localhost

[mdozhdev]

Why

The suite assumes the regtest stack runs on the machine the tests run on — LND at localhost, its cert and macaroon read from the working copy, and connectToLND typing 0.0.0.0 into the app.

That holds only while Docker and the iOS Simulator share a host. GitHub-hosted macOS runners cannot run Docker (Apple's Virtualization framework has no nested virtualization for macOS guests, closed not planned), which is why the iOS suite runs on a self-hosted Mac at ~2h per run against ~20m for the same tests on Android's hosted Linux runners.

What

Makes the address configurable. Every current default is preserved, so existing runs are unaffected.

File	Change
docker-compose.yml	LND advertises LND_EXTERNAL_IP, else 127.0.0.1
constants.ts	lndConfig host, ports and credential paths from env
lnd.ts	connectToLND uses the configured host
wdio.conf.ts	forwards E2E_LOCAL_HOST into the app's launch environment

Credential paths are separate from the host because they are files — they have to be fetched from wherever the stack runs before the suite can read them.

wdio.conf.ts is the link that is easy to miss: setting E2E_LOCAL_HOST in a workflow only sets it on the runner's shell. Appium launches the app as a separate process, so it needs processArguments.env to reach Env.swift.

Scope

This is the groundwork both candidate approaches need, split out so it can be agreed independently of which one is chosen:

• test: run the regtest stack on an ephemeral VM #204 — stack on an ephemeral GCP VM
• test: demonstrate the regtest stack on a second GH runner #205 — stack on a second GitHub-hosted runner

Both depend on this. On its own it changes no behaviour — nothing sets these variables yet.

The matching app-side change is synonymdev/bitkit-ios#680, which lets Env.swift read E2E_LOCAL_HOST at launch rather than only from Info.plist at build time.

Verified

tsc --noEmit and eslint clean. docker compose config renders 127.0.0.1 with nothing set and the supplied address when LND_EXTERNAL_IP is present; confirmed against a running LND that it advertises the injected value.

Related

• synonymdev/pubky-stack#275