build: compress the test builds
build: compress the test builds

This is to use less space and to fix the caddy/rclone interaction
using too much bandwidth.

See: https://caddy.community/t/how-to-stop-caddy-sniffing-mime-types-and-return-a-default-mime-type/6819

ncw/rclone,ncw/rclone,ncw/rclone,ncw/rclone