update the app

build_prod_andr.md

@@ -0,0 +1,17 @@
+Run it from the project root:
+
+  ./build_prod_apk.sh
+
+  The APK lands at build/outputs/rentaldrivego-release.apk.
+
+  One thing to sort out before distributing — the build.gradle.kts currently signs with the debug
+   key in release mode:
+  signingConfig = signingConfigs.getByName("debug")
+  That's fine for internal testing, but app stores and most MDM systems require a proper release
+  keystore. When you're ready to publish:
+  
+  1. Generate a keystore once:
+  keytool -genkey -v -keystore android/rentaldrivego.jks \
+    -alias rentaldrivego -keyalg RSA -keysize 2048 -validity 10000
+  2. Add the signing config to android/app/build.gradle.kts pointing at that keystore
+  3. Add android/rentaldrivego.jks to .gitignore