zj nice catches

app/models/ci/build.rb

@@ -196,7 +196,7 @@ module Ci
       variables += user_variables
       variables += project.secret_variables_for(ref).map(&:to_runner_variable)
       variables += trigger_request&.user_variables || []
-      variables += pipeline.pipeline_schedule&.variables&.map(&:to_runner_variable) || []
+      variables += pipeline.pipeline_schedule&.job_variables
       variables
     end
 

app/models/ci/pipeline_schedule.rb

@@ -59,5 +59,9 @@ module Ci
       Gitlab::Ci::CronParser.new(worker_cron, worker_time_zone)
                             .next_time_from(next_run_at)
     end
+
+    def job_variables
+      variables&.map(&:to_runner_variable) || []
+    end
   end
 end

spec/models/ci/build_spec.rb

@@ -1373,20 +1373,18 @@ describe Ci::Build, :models do
       it { is_expected.to include(predefined_trigger_variable) }
     end
 
-    context 'when build was triggered by scheduled pipeline' do
-      let(:secret_variable) do
-        { key: 'SECRET_KEY', value: 'secret_value', public: false }
-      end
-
+    context 'when a job was triggered by a pipeline schedule' do
       let(:pipeline_schedule) { create(:ci_pipeline_schedule, project: project) }
+      let!(:pipeline_schedule_variable) do
+        create(:ci_pipeline_schedule_variable, key: 'SCHEDULE_VARIABLE_KEY',
+          pipeline_schedule: pipeline_schedule)
+      end
 
       before do
         pipeline_schedule.pipelines << pipeline
-        create(:ci_pipeline_schedule_variable,
-               secret_variable.slice(:key, :value).merge(pipeline_schedule: pipeline_schedule))
       end
 
-      it { is_expected.to include(secret_variable) }
+      it { is_expected.to include(pipeline_schedule_variable.to_runner_variable) }
     end
 
     context 'when yaml_variables are undefined' do

spec/models/ci/pipeline_schedule_spec.rb

@@ -118,4 +118,15 @@ describe Ci::PipelineSchedule, models: true do
       end
     end
   end
+
+  describe '#job_variables' do
+    let!(:pipeline_schedule) { create(:ci_pipeline_schedule, :nightly) }
+    let!(:pipeline_schedule_variables) do
+      create_list(:ci_pipeline_schedule_variable, 2, pipeline_schedule: pipeline_schedule)
+    end
+
+    subject { pipeline_schedule.job_variables }
+
+    it { is_expected.to eq(pipeline_schedule_variables.map(&:to_runner_variable)) }
+  end
 end

spec/models/ci/pipeline_schedule_variable_spec.rb

@@ -3,6 +3,6 @@ require 'spec_helper'
 describe Ci::PipelineScheduleVariable, models: true do
   subject { build(:ci_pipeline_schedule_variable) }
 
-  it { is_expected.to be_kind_of(HasVariable) }
+  it { is_expected.to include_module(HasVariable) }
   it { is_expected.to validate_uniqueness_of(:key).scoped_to(:pipeline_schedule_id) }
 end