incorporates and implements mobile build service functionality.

.env.example

@@ -27,3 +27,18 @@ API_UPSTREAM=http://api:8000
 #   "http://yourhost:8000" — direct mode: browser calls the API container directly (CORS required).
 # Use direct mode when an external ingress layer (e.g., TrueNAS middleware) breaks the nginx proxy chain.
 API_PUBLIC_URL=""
+
+# ── Mobile Build (Android — Flutter build container) ────────────────
+# The build container runs alongside api/frontend in the same docker-compose project.
+# The api container SSHes directly into the build container over the Docker network.
+# Default is "build" (the docker-compose service name) — usually no override needed.
+# KMTN_FLUTTER_BUILD_HOST=build
+
+# Git repository URL for the Flutter project (cloned inside the build container)
+# KMTN_FLUTTER_PROJECT_REPO_URL=http://192.168.1.74:30008/kfj001/kryz-go-flutter.git
+
+# Project directory inside the build container (tilde expands to /home/vscode)
+# KMTN_FLUTTER_PROJECT_DIR=~/kryz-go-flutter
+
+# Glob pattern to find the built APK inside the build container
+# KMTN_FLUTTER_APK_GLOB=~/kryz-go-flutter/build/app/outputs/flutter-apk/app-*.apk