Install dependencies
sudo apt-get install bundler yui-compressor librsvg2-bin build-essential ruby-dev
Install ruby dependencies
bundle install
Build the website
bundle exec jekyll build
Generate a stub for the new post
bundle exec rake new_post["XCSoar 6.8.12 released"]
Edit the new post, created in ./_posts
If there is a new relase also update _config.yml with the new release number.