Build the service in a container, and fix what the target compiler found

The openlgtv NDK is a Linux toolchain with no macOS or Windows build, so
tools/build.sh could not produce a binary anywhere else. docker-build.sh
bakes the SDK into an image and compiles there; packaging and deploy stay
on the host, where the TV is reachable. The SDK ships aarch64 as well as
x86_64, so the image picks the one matching the daemon and Apple Silicon
builds natively rather than under emulation.

Cross-compiling for real turned up three things the host compiler did
not:

  sink_hyperhdr_viz.c  read p->width and p->height to format the error
                       message after free(p)
  sink_hyperhdr.c      an SDP connection line of 128 bytes cannot hold
                       "IN IP4 " plus a 127-byte host plus "/255", so a
                       long hostname would silently lose its TTL suffix
  common/log.c         the log body was sized to the whole ring line,
                       leaving nothing for the prefix; budget for it so
                       the bound is provable rather than left to
                       snprintf

A clean cross-compile is now warning-free, and readelf confirms the
design rule holds: luna-service2, glib, PmLogLib and libc, with no
libpulse or libasound.

Also: @webosose/ares-cli was pinned to ^3.0.0, which does not exist
(latest is 2.4.0), so npm install failed outright. build.sh now puts
node_modules/.bin on PATH so a local install is enough.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/build.sh

@@ -17,6 +17,10 @@ set -euo pipefail
 ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 cd "$ROOT"
 
+# `npm install` puts ares-cli here rather than on PATH, so a local install works
+# without also needing the global one.
+[ -d "$ROOT/node_modules/.bin" ] && PATH="$ROOT/node_modules/.bin:$PATH"
+
 APP_ID=org.webosbrew.audiocap
 SERVICE_ID=$APP_ID.service
 BINARY=audiocap-service
@@ -52,6 +56,11 @@ Download and unpack the buildroot NDK, then point WEBOS_SDK at it:
   \$HOME/arm-webos-linux-gnueabi_sdk-buildroot/relocate-sdk.sh
 
   WEBOS_SDK=\$HOME/arm-webos-linux-gnueabi_sdk-buildroot ./tools/build.sh
+
+The SDK only runs on Linux. On macOS or Windows, compile in a container
+instead and then come back here to package:
+
+  ./tools/docker-build.sh && ./tools/build.sh package
 EOF
     exit 1
   fi