Adds a self-contained local APK build path. Only Docker is required on the host — no JDK, no Android SDK, no Node. Mirrors .github/workflows/build-android.yml inside a vendored image so anyone who clones the repo can build the APK with one command.
- docker/android-builder/Dockerfile — node:22-bookworm-slim (pinned by digest) + Temurin JDK 21 + Android SDK 35 + build-tools 35.0.0 and 34.0.0 (AGP 8.7.x's silent internal minimum). JAVA_HOME symlinked via dpkg --print-architecture so the image works on amd64 and arm64.
- scripts/build-apk-local.sh — orchestrator that builds the image on first run, then runs the container as the host uid:gid with the repo bind-mounted and three repo-local cache dirs. Uses --network host (Docker Desktop 4.34+ on macOS/Windows) to dodge a default-bridge apt-download failure.
- docs/android-apk.md — splits Prerequisites into Docker (Path A, recommended) and Native (Path B), adds a Local Docker build section.
- .gitignore — adds .docker-cache/.
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