refactor: move app-release-template to monorepo

frontend/app-release-template/static/fastlane-android/Appfile

@@ -0,0 +1,2 @@
+#json_key_file("../../playstore_api_key.json")                       # Don't Change
+package_name ENV["ANDROID_PACKAGE_NAME"] || "de.anyschool.app.droid" # Don't Change

frontend/app-release-template/static/fastlane-android/Fastfile

@@ -0,0 +1,99 @@
+# This file contains the fastlane.tools configuration for Android
+# You can find the documentation at https://docs.fastlane.tools
+#
+# For a list of all available actions, check out
+#
+#     https://docs.fastlane.tools/actions
+#
+# For a list of all available plugins, check out
+#
+#     https://docs.fastlane.tools/plugins/available-plugins
+#
+
+# Uncomment the line if you want fastlane to automatically update itself
+# update_fastlane
+
+require 'json'
+require 'base64'
+require 'pathname'
+
+default_platform(:android)
+
+current_version_code = 1
+playstore_track = "internal"
+package_json = JSON.parse(File.read('../../package.json'))
+keystorePath = Pathname.getwd.parent  + "../../playstore.keystore"
+
+platform :android do
+
+  lane :fetch_version_code do
+    current_version_code = google_play_track_version_codes(
+      package_name:  ENV['ANDROID_PACKAGE_NAME'],
+      track: playstore_track,
+      json_key_data: ENV['ANDROID_API_KEY_CONTENT']
+    ).max
+  end
+
+  lane :fetch_highest_version_code do
+    version_code_candidates = [1]
+    tracks = ['production', 'beta', 'internal']
+    tracks.each do |t|
+      version_code_candidates += google_play_track_version_codes(
+        package_name: ENV['ANDROID_PACKAGE_NAME'],
+        track: t,
+        json_key_data: Base64.decode64(ENV['ANDROID_API_KEY_CONTENT'])
+      )
+    end
+    current_version_code = version_code_candidates.compact.max
+    puts "Version code chosen for build lane: %d" % [current_version_code + 1] 
+  end
+
+  lane :build do
+    fetch_highest_version_code
+    android_set_version_name(
+      version_name: package_json["version"],
+    )
+    android_set_version_code(
+      version_code: current_version_code + 1,
+    )
+    gradle(
+      task: "clean assemble",
+      build_type: "Release",
+      print_command: false,
+      properties: {
+        "android.injected.signing.store.file" => keystorePath.to_s,
+        "android.injected.signing.store.password" => ENV['ANDROID_KEYSTORE_PASSWORD'],
+        "android.injected.signing.key.alias" => ENV['ANDROID_KEYSTORE_KEY_ALIAS'],
+        "android.injected.signing.key.password" => ENV['ANDROID_KEYSTORE_KEY_PASSWORD']
+      }
+    )
+  end
+
+  desc "Submit a new beta build to open beta testing track"
+  lane :beta do
+    playstore_track = "beta"
+
+    build
+    upload_to_play_store(
+      track: playstore_track,
+      json_key_data: Base64.decode64(ENV['ANDROID_API_KEY_CONTENT']),
+      skip_upload_metadata: true,
+      skip_upload_images: true,
+      skip_upload_screenshots: true
+    )
+  end
+
+  desc "Submit a new version to the Google Play"
+  lane :release do
+    playstore_track = "production"
+
+    build
+    upload_to_play_store(
+      track: playstore_track,
+      json_key_data: Base64.decode64(ENV['ANDROID_API_KEY_CONTENT']),
+      skip_upload_metadata: true,
+      skip_upload_images: true,
+      skip_upload_screenshots: true
+    )
+  end
+end