Replace pull_worker script with rake task

Author: Julián Berbel Alt

.github/workflows/test_and_deploy.yml

@@ -16,7 +16,7 @@ jobs:
         bundler: 2.1.4
         bundler-cache: true
     - name: Pull worker
-      run: bin/pull_worker.sh
+      run: bundle exec rake pull_worker
     - name: Run tests
       run: bundle exec rake
     - name: Deploy

Rakefile

@@ -1,5 +1,12 @@
 require 'rspec/core/rake_task'
+require_relative 'lib/javascript_runner'
 
 RSpec::Core::RakeTask.new(:spec)
 
+task :pull_worker do
+  image = Mumukit.config.docker_image
+  puts "Fetching image #{image}..."
+  Docker::Image.create('fromImage' => image)
+end
+
 task :default => :spec