add schedulable? class method to cron jobs

app/jobs/cron/cron_job.rb

@@ -3,6 +3,10 @@ class Cron::CronJob < ApplicationJob
   class_attribute :schedule_expression
 
   class << self
+    def schedulable?
+      true
+    end
+
     def schedule
       remove if cron_expression_changed?
       set(cron: cron_expression).perform_later if !scheduled?

app/jobs/cron/datagouv/export_and_publish_demarches_publiques_job.rb

@@ -15,4 +15,8 @@ class Cron::Datagouv::ExportAndPublishDemarchesPubliquesJob < Cron::CronJob
       FileUtils.rm(gzip_filepath)
     end
   end
+
+  def self.schedulable?
+    ENV.fetch('OPENDATA_ENABLED', nil) == 'enabled'
+  end
 end

spec/jobs/cron/cron_job_spec.rb

@@ -0,0 +1,7 @@
+RSpec.describe Cron::Datagouv::ExportAndPublishDemarchesPubliquesJob, type: :job do
+  describe '#schedulable?' do
+    it 'is schedulable by default' do
+      expect(Cron::CronJob.schedulable?).to be_truthy
+    end
+  end
+end

spec/jobs/cron/datagouv/export_and_publish_demarches_publiques_job_spec.rb

@@ -25,4 +25,19 @@ RSpec.describe Cron::Datagouv::ExportAndPublishDemarchesPubliquesJob, type: :job
       expect(Dir.glob("*demarches.json.gz", base: 'tmp').empty?).to be_truthy
     end
   end
+
+  describe '#schedulable?' do
+    context "when ENV['OPENDATA_ENABLED'] == 'enabled'" do
+      it 'is schedulable' do
+        ENV['OPENDATA_ENABLED'] = 'enabled'
+        expect(Cron::Datagouv::ExportAndPublishDemarchesPubliquesJob.schedulable?).to be_truthy
+      end
+    end
+    context "when ENV['OPENDATA_ENABLED'] != 'enabled'" do
+      it 'is schedulable' do
+        ENV['OPENDATA_ENABLED'] = nil
+        expect(Cron::Datagouv::ExportAndPublishDemarchesPubliquesJob.schedulable?).to be_falsy
+      end
+    end
+  end
 end