Builder: docker build with --network host for bridge:none daemons.

Alpine lab nodes use bridge:none; RUN steps need host networking for apt/sdk.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-build-runner.sh

@@ -341,6 +341,7 @@ else
     docker_ctx="$(dirname "$dockerfile")"
   fi
   run_step docker-build docker build \
+    --network host \
     --build-arg ANDROIDCAST_CI_VERSION="${CI_VERSION}" \
     -t "$IMAGE" \
     -f "${dockerfile}" \