build: add android build script

Author: DCsunset

scripts/build-android.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+
+CD=$(dirname $0)
+cd $CD/../android
+
+RELEASE_DIR="app/build/outputs/apk/release"
+BUILD_TOOLS="$HOME/app/android-sdk/build-tools/30.0.3"
+
+./gradlew build
+
+$BUILD_TOOLS/zipalign -f -v -p 4 \
+	$RELEASE_DIR/app-release-unsigned.apk \
+	$RELEASE_DIR/app-release-unsigned-aligned.apk
+
+$BUILD_TOOLS/apksigner sign --ks $HOME/.android/release-key.jks \
+	--out $RELEASE_DIR/app-release.apk \
+	$RELEASE_DIR/app-release-unsigned-aligned.apk
+
+