--network=none does nothing

[SpecLad]

Description

The --network=none flag seems to have no effect when used with buildah build.

Steps to reproduce the issue:

1. Create a test.containerfile file with the following contents:

FROM docker.io/curlimages/curl

RUN curl -I https://www.yahoo.com/

2. Run buildah build --network=none -f test.containerfile.

Describe the results you received:
The curl invocation succeeds.

Describe the results you expected:
The curl invocation (and the build along with it) should fail.

Output of rpm -q buildah or apt list buildah:

buildah/jammy,now 1.23.1+ds1-2 amd64 [installed]

Output of buildah version:

Version:         1.23.1
Go Version:      go1.17
Image Spec:      1.0.1
Runtime Spec:    1.0.2-dev
CNI Spec:        0.4.0
libcni Version:
image Version:   5.16.0
Git Commit:
Built:           Thu Jan  1 03:00:00 1970
OS/Arch:         linux/amd64
BuildPlatform:   linux/amd64

This version is pretty old, however, I can still reproduce the issue with the latest Git commit (9e2b0e2).

Output of podman version if reporting a podman build issue: N/A

Output of cat /etc/*release:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.1 LTS"
PRETTY_NAME="Ubuntu 22.04.1 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.1 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

Output of uname -a:

Linux Freezie 5.10.102.1-microsoft-standard-WSL2 #1 SMP Wed Mar 2 00:30:59 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Output of cat /etc/containers/storage.conf:

cat: /etc/containers/storage.conf: No such file or directory