fix to generate p8 file for every calling altool

fastlane_core/lib/fastlane_core/itunes_transporter.rb

@@ -237,7 +237,7 @@ def execute(command, hide_output)
     def build_upload_command(username, password, source = "/tmp", provider_short_name = "", jwt = nil, platform = nil, api_key = nil)
       use_api_key = !api_key.nil?
       [
-        ("API_PRIVATE_KEYS_DIR=#{api_key[:key_filepath]}" if use_api_key),
+        ("API_PRIVATE_KEYS_DIR=#{Dir.tmpdir}" if use_api_key),
         "xcrun altool",
         "--upload-app",
         ("-u #{username.shellescape}" unless use_api_key),
@@ -691,8 +691,19 @@ def upload(app_id = nil, dir = nil, package_path: nil, asset_path: nil, platform
 
       password_placeholder = @jwt.nil? ? 'YourPassword' : nil
       jwt_placeholder = @jwt.nil? ? nil : 'YourJWT'
-      api_key_placeholder = nil unless !@api_key.nil?
-      api_key_placeholder = { key_id: "YourKeyID", issuer_id: "YourIssuerID", key_filepath: "YourKeyFilepath" } if !@api_key.nil?
+
+      # Handle AppStore Connect API
+      use_api_key = !@api_key.nil?
+      api_key_placeholder = nil unless use_api_key
+      api_key_placeholder = { key_id: "YourKeyID", issuer_id: "YourIssuerID" } if use_api_key
+
+      if use_api_key
+        # Specified p8 needs to be generated to call altool
+        tmp_p8_file_path = File.join(Dir.tmpdir, "AuthKey_#{@api_key[:key_id]}.p8")
+        p8 = File.open(tmp_p8_file_path, "w")
+        p8.write(@api_key[:key])
+        p8.close
+      end
 
       command = @transporter_executor.build_upload_command(@user, @password, actual_dir, @provider_short_name, @jwt, platform, @api_key)
       UI.verbose(@transporter_executor.build_upload_command(@user, password_placeholder, actual_dir, @provider_short_name, jwt_placeholder, platform, api_key_placeholder))
@@ -702,6 +713,11 @@ def upload(app_id = nil, dir = nil, package_path: nil, asset_path: nil, platform
       rescue TransporterRequiresApplicationSpecificPasswordError => ex
         handle_two_step_failure(ex)
         return upload(app_id, dir, package_path: package_path, asset_path: asset_path)
+      ensure
+        if use_api_key
+          tmp_p8_file_path = File.join(Dir.tmpdir, "AuthKey_#{@api_key[:key_id]}.p8")
+          FileUtils.rm_f(tmp_p8_file_path)
+        end
       end
 
       if result