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Test with buildah-1.27.2-2.module+el8.7.0+16994+ed730e67.x86_64 and it report 404 error as expected. So move this to verified:
# buildah bud .
STEP 1/2: FROM registry.fedoraproject.org/fedora:36
Trying to pull registry.fedoraproject.org/fedora:36...
Getting image source signatures
Copying blob 62946078034b done  
Copying config 2ecb6df959 done  
Writing manifest to image destination
Storing signatures
STEP 2/2: ADD https://mirror.init7.net/fedora/fedora/linux/releases/36/Server/x86_64/iso/Fedora-Server-netinst-x86_64-36-1.5.foo /
error building at STEP "ADD https://mirror.init7.net/fedora/fedora/linux/releases/36/Server/x86_64/iso/Fedora-Server-netinst-x86_64-36-1.5.foo /": error reading "https://mirror.init7.net/fedora/fedora/linux/releases/36/Server/x86_64/iso/Fedora-Server-netinst-x86_64-36-1.5.foo": invalid response status 404

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: container-tools:rhel8 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:7822