build(scripts): Add bash script to automate build step

Author: NoahJinnn

.gitignore

@@ -49,4 +49,5 @@ app.*.map.json
 android/app/google-services.json
 ios/Runner/GoogleService-Info.plist
 ios/firebase_app_id_file.json
-lib/firebase_options.dart
+lib/firebase_options.dart
+scripts/*.plist

README.md

@@ -15,3 +15,10 @@ The Silent Shard mobile app is an MPC-based Threshold Signer app as a usable, se
 - Navigate to the project directory
 - Install dependencies: `flutter pub get`
 - Run the app: `flutter run`
+
+### Build
+- Build the app:
+    - Android: `./build_android.sh [stg|prod]`
+    - iOS: `./build_ios.sh [stg|prod]`
+
+- Before building the app using the scripts, make sure to update the version in `pubspec.yaml` and copy `GoogleService-Info_<environment>.plist` into `scripts` (iOS only), you could find the file in the [Firebase console](https://console.firebase.google.com/u/0/project/mobile-wallet-mm-snap-staging/settings/general/ios:com.silencelaboratories.silentshard).

scripts/build_android.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+set -e
+DIR=$(dirname $0)
+
+if [ -z "$1" ] || [ "$1" = "--help" ]; then
+    echo "Usage: ./build_android.sh [stg|prod]"
+    exit 1
+fi
+
+if [ "$1" = "stg" ]; then
+    echo "Building for staging"
+
+    flutter build apk --release
+elif [ "$1" = "prod" ]; then
+    echo "Building for prod"
+
+    flutter build appbundle
+else
+    echo "Invalid argument. Please use 'stg' or 'prod'"
+    exit 1
+fi

scripts/build_ios.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+set -e
+DIR=$(dirname $0)
+
+if [ -z "$1" ] || [ "$1" = "--help" ]; then
+    echo "Usage: ./build_ios.sh [stg|prod]"
+    exit 1
+fi
+
+if [ "$1" = "stg" ]; then
+    echo "Building for staging"
+
+    if [ ! -f "$DIR/GoogleService-Info_stg.plist" ]; then
+        echo "GoogleService-Info_stg.plist not found! Please add it to the scripts folder"
+        exit 1
+    fi
+
+    cp $DIR/GoogleService-Info_stg.plist ios/Runner/GoogleService-Info.plist
+
+    flutter build ipa
+elif [ "$1" = "prod" ]; then
+    echo "Building for prod"
+
+    if [ ! -f "$DIR/GoogleService-Info_prod.plist" ]; then
+        echo "GoogleService-Info-prod.plist not found! Please add it to the scripts folder"
+        exit 1
+    fi
+
+    cp $DIR/GoogleService-Info_prod.plist ios/Runner/GoogleService-Info.plist
+
+    flutter build ipa
+else
+    echo "Invalid argument. Please use 'stg' or 'prod'"
+    exit 1
+fi