chore: Implement playstore CD

android/fastlane/Fastfile

@@ -0,0 +1,50 @@
+# This file contains the fastlane.tools configuration
+# 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
+
+default_platform(:android)
+
+platform :android do
+  lane :set_build_code_internal do
+    versions = google_play_track_version_codes(
+        track: "internal",
+        json_key: "./keys.json"
+      )
+    last_version = versions[0].to_i
+    Dir.chdir("../..") do
+      re = /version:\s([0-9]*\.[0-9]*\.[0-9]*)\+[0-9]/i
+      config = File.read("./pubspec.yaml")
+      version_name = config.match(re).captures
+
+      subst = "version: #{version_name[0]}+#{last_version+1}"
+
+      result = config.gsub(re, subst)
+
+      File.open("./pubspec.yaml", 'w') { |file| file.write(result) }
+    end
+  end
+
+  lane :deploy_internal_test do
+    versions = google_play_track_version_codes(
+        track: "internal",
+        json_key: "./keys.json"
+      )
+    last_version = versions[0].to_i
+    upload_to_play_store(track: 'internal', aab: '../build/app/outputs/bundle/release/app-release.aab', version_code: "#{last_version+1}")
+  end
+
+  lane :deploy_release do
+    upload_to_play_store(track: 'internal', track_promote_to: "production", deactivate_on_promote: false, skip_upload_changelogs: true)
+  end
+end