ci: Add Cirrus CI build for FreeBSD
ci: Add Cirrus CI build for FreeBSD

Add a CI build for FreeBSD using Cirrus CI.

We can use Github Workflow for Linux, macOS, and Windows.

gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2