There are a few ways you can go about this. The most prominent and most immediate way is to modify your docpad configuration file to trigger an external tool like grunt to minify your assets via the grunt minify task. Here is a gist that showcases this.
Alternatively, there is also Cloudflare which is an amazing website DNS server that also acts as a CDN for your website's content, and minifies your assets automatically post-deployment. Read more here.
Also, while it isn't minify related, you can also concatenate your scripts with Browserify using this gist. Grunt also has a more straightfoward way of concatenating as well via the grunt concat task.
В конце концов, возможно, плагины сделают это автоматически, но, учитывая изменчивость с конкатенацией, это может быть некоторое время.