refactor: add mulitple customization features

static/fastlane-android/Appfile

@@ -1 +1,2 @@
-json_key_file("../../../playstore_api_key.json") # Don't Change
+json_key_file("../../playstore_api_key.json")                     # Don't Change
+package_name ENV["ANDROID_PACKAGE_NAME"] || "de.anyschool.app.droid" # Don't Change

static/fastlane-android/Fastfile

@@ -13,22 +13,61 @@
 # Uncomment the line if you want fastlane to automatically update itself
 # update_fastlane
 
+require 'json'
+
 default_platform(:android)
 
+version_code = 1
+playstore_track = "internal"
+package_json = JSON.parse(File.read('../../package.json'))
+
 platform :android do
   desc "Runs all the tests"
   lane :test do
     gradle(task: "test")
   end
 
-  desc "Submit a new Beta Build to Crashlytics Beta"
+  lane :fetch_version_code do
+    version_code = google_play_track_version_codes(
+      package_name:  ENV['ANDROID_PACKAGE_NAME'],
+      track: playstore_track,
+      json_key: '../../playstore_api_key.json'
+    ).max
+  end
+
+  lane :build do
+    gradle(
+      task: "clean assemble",
+      build_type: "Release",
+      print_command: false,
+      properties: {
+        "android.injected.signing.store.file" => "../../../playstore.keystore",
+        "android.injected.signing.store.password" => "",
+        "android.injected.signing.key.alias" => "",
+        "android.injected.signing.key.password" => "",
+        "versionCode" => version_code,
+        "versionName" => package_json['version']
+      }
+    )
+  end
+
+  desc "Submit a new beta build to internal testing track"
   lane :beta do
-    gradle(task: "clean assembleRelease")  
+    playstore_track = "internal"
+
+    build
+    upload_to_play_store(
+      track: playstore_track,
+      json_key: '../../playstore_api_key.json',
+      skip_upload_metadata: true,
+      skip_upload_images: true,
+      skip_upload_screenshots: true
+    )
   end
 
   desc "Deploy a new version to the Google Play"
   lane :release do
-    gradle(task: "clean assembleRelease")
-    #upload_to_play_store
+    build
+    #upload_to_play_store(json_key: '../../playstore_api_key.json', skip_upload_metadata: true, skip_upload_images: true)
   end
 end