Comment 3 for bug 1777474

Yes, I can reproduce the issue with that ISO as well. Since I've booted the ISO in a VM with only a serial console and no video card, I've added "console=ttyS0,115200" to the installer kernel's cmdline in GRUB, and cancelled installation as soon as possible to get to the big menu with all the installation steps, so I could select "Execute shell". From there, I've tried downloading a file from an HTTPS site with a valid Let's Encrypt certificate, and got the ominous "ERROR: cannot verify $HOSTNAME's certificate, issued by $CA: Unable to locally verify the issuer's authority." message.

So yes, the "official" installer ISO images seem to lack the ca-certificates package as well.