auto increase build_number for testflight

ios/fastlane/Fastfile

@@ -47,11 +47,8 @@ platform :ios do
   end
 
   desc "Description of what the lane does"
-    lane :deployToTestFlight do
-      setupCodeSigning()
-      ipa_name = "Release.ipa"
-      buildReleaseIPA(ipa_name: ipa_name, method: "app-store")
-
+    lane :deployToTestFlight do |options|
+      skip_build_number_increase = options[:skip_build_number_increase] # optional, if not set, it gets the last from TestFlight then adds + 1
       app_store_connect_api_key(
           key_id: APP_STORE_API_KEY_ID,
           issuer_id: APP_STORE_API_KEY_ISSUER_ID,
@@ -60,6 +57,16 @@ platform :ios do
           in_house: false  # optional but may be required if using match/sigh
       )
 
+      if skip_build_number_increase.nil?
+        increment_build_number({
+            build_number: latest_testflight_build_number(app_identifier: APP_IDENTIFIER) + 1
+        })
+      end
+
+      setupCodeSigning()
+      ipa_name = "Release.ipa"
+      buildReleaseIPA(ipa_name: ipa_name, method: "app-store")
+
       upload_to_testflight(
           skip_submission: true,
           ipa: "./builds/#{ipa_name}",