Ensure target can validate https certificates when using the https protocol for mirrors
Tested (with other changes) using simple-cdd
with the config:
CODENAME="sid"
# daily images
DI_WWW_HOME="default"
When selecting a https mirror apt-get (and as a consequence apt-setup-verify) requires ca-certificates
to be installed to verify the https certificate.
I tried to use some random debian installer 10.6 and use https://deb.debian.org/debian/ as mirror and it will fail due to missing ca-certificates.