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.