fdroid: Add build.gradle_fdroid (WAR)

Need to copy build.gradle_fdroid to overwrite build.gradle before building.

src/ui/flutter_app/android/app/build.gradle_fdroid

@@ -0,0 +1,108 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file('key.properties')
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+} else {
+    if (System.getenv('KEY_STORE_PASSWORD')) {
+        keystoreProperties.setProperty('storePassword', System.getenv('KEY_STORE_PASSWORD'));
+        keystoreProperties.setProperty('keyPassword', System.getenv('KEY_PASSWORD'));
+        keystoreProperties.setProperty('keyAlias', System.getenv('ALIAS'));
+        keystoreProperties.setProperty('storeFile', System.getenv('KEY_PATH'));
+	} else {
+	    //throw new GradleException("key.properties not found. Copy key.properties.example to key.properties and modify it to suit your needs.")
+	}
+}
+
+android {
+    compileSdkVersion 30
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        applicationId "com.calcitem.sanmill"
+        minSdkVersion 16
+        targetSdkVersion 30
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        ndk{
+            ldLibs "log"
+            debugSymbolLevel 'FULL'
+        }
+        externalNativeBuild {
+            cmake {
+                //arguments "-DANDROID_ARM_MODE=arm", "-DANDROID_STL=c++_shared"
+                //abiFilters "arm64-v8a"
+            }
+        }
+    }
+
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile file(keystoreProperties['storeFile'])
+            storePassword keystoreProperties['storePassword']
+        }
+    }
+    buildTypes {
+        debug {
+            signingConfig signingConfigs.debug
+            //applicationIdSuffix ".debug"
+            //debuggable true
+        }
+        release {
+            signingConfig signingConfigs.release
+        }
+    }
+
+    flavorDimensions "deploy"
+
+    productFlavors {
+        fdroid {
+            dimension "deploy"
+            signingConfig null
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+	implementation 'com.iqiyi.xcrash:xcrash-android-lib:3.0.0'
+}