build-arch jobs failing with "Error: unmarshalling error into &errorhandling.ErrorModel"

[jlebon]

E.g.:

12:01:38  + cosa init --force --branch stable --commit=94973f12ca41cefb52d2f405f7f38c3b5b650049 https://github.com/coreos/fedora-coreos-config
12:01:39  warning: /sys/fs/selinux appears to be mounted but should not be; enabling workaround
12:01:39  + mkdir -p src
12:01:39  + cd src
12:01:39  + test -e config
12:01:39  + case "${source}" in
12:01:39  + git clone --branch=stable --depth=1 --shallow-submodules --recurse-submodules https://github.com/coreos/fedora-coreos-config config
12:01:39  Cloning into 'config'...
12:01:39  + '[' -n 94973f12ca41cefb52d2f405f7f38c3b5b650049 ']'
12:01:39  + git -C ./config fetch origin 94973f12ca41cefb52d2f405f7f38c3b5b650049
12:01:39  From https://github.com/coreos/fedora-coreos-config
12:01:39   * branch            94973f12ca41cefb52d2f405f7f38c3b5b650049 -> FETCH_HEAD
12:01:39  + git -C ./config reset --hard 94973f12ca41cefb52d2f405f7f38c3b5b650049
12:01:39  HEAD is now at 94973f1 tree: promote changes from testing at 1c8e2d07af27fd856f6fd0be390d7d583cc56852
12:01:39  + git -C ./config submodule update --init --recursive
12:01:39  + set +x
12:01:39  Config commit: 94973f12ca41cefb52d2f405f7f38c3b5b650049
12:01:39  + manifest=src/config/manifest.yaml
12:01:39  + image=src/config/image.yaml
12:01:39  + [[ ! -f src/config/manifest.yaml ]]
12:01:39  + [[ ! -f src/config/image.yaml ]]
12:01:39  + [[ -n '' ]]
12:01:39  + mkdir -p cache
12:01:39  + mkdir -p builds
12:01:39  + mkdir -p tmp
12:01:39  + mkdir -p overrides/rpm
12:01:39  + mkdir -p overrides/rootfs
12:01:39  + test 0 = 1
12:01:39  + case "${YUMREPOS}" in
12:01:39  + set +x
12:01:39  Initialized /home/jenkins/agent/workspace/build-arch as coreos-assembler working directory.
12:01:39  Error: unmarshalling error into &errorhandling.ErrorModel{Because:"", Message:"", ResponseCode:0}, data "Not Found\n": invalid character 'N' looking for beginning of value

This seems to be a regression of podman v4.8: containers/podman#20821