Add release script

Author: marocchino

Rakefile

@@ -33,3 +33,22 @@ desc "Generates the Jekyll site and starts local server"
 task :preview do
   sh 'jekyll serve --watch'
 end
+
+desc "Release the current commit to ruby-korea/ruby-korea.github.io@gh-pages"
+task :release do
+  commit = `git rev-parse HEAD`.chomp
+  system "mkdir -p vendor/ruby-korea.github.io"
+  system "git clone git@github.com:ruby-korea/ruby-korea.github.io.git vendor/ruby-korea.github.io"
+
+  Dir.chdir "vendor/ruby-korea.github.io" do
+    sh "git reset --hard HEAD"
+    sh "git checkout gh-pages"
+    sh "git pull origin gh-pages"
+
+    rm_rf FileList["*"]
+    cp_r FileList["../../_site/*"], "./"
+    sh "git add -A ."
+    sh "git commit -m 'ruby-korea/ruby-korea.github.io@#{commit}'"
+    sh "git push origin gh-pages"
+  end
+end