Fix: Missing ca-certificates in debootstrap base system

[ctrbts]

Description: When building the OS from a clean environment, debootstrap with --variant=minbase does not install ca-certificates. This causes subsequent apt operations over HTTPS to fail with SSL routines::certificate verify failed.

Fix: Added ca-certificates to the --include list in the download_base_system function within build.sh.

[Anduin2017]

However mod 03 just installed it back.