I just added experimental CDN support to Dockpress.
Simply comment out and edit the relevant environment variables in the Dockerfile and your static assets will be downloaded from a CDN/proxy server instead of your main web server.
Set CDN_SCOPE to ‘uploads’ and what resides in wp-content/uploads will be directed to the CDN URL defined with CDN_UPLOADS_URL.
Set CDN_SCOPE to ‘content’ and assets from in wp-content will be fetched from CDN_CONTENT_URL.