builder: New container image

This will be the container image buildroot.

TODO: Build this using RHTAP too

builder/Containerfile

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+# This image contains the baseline tools to build bootable base images.
+FROM quay.io/centos/centos:stream9
+COPY coreos-continuous.repo /etc/yum.repos.d
+COPY . /src
+RUN /src/build.sh && cd / && rm /src -rf

builder/build.sh

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+#!/bin/bash
+set -xeuo pipefail
+
+pkginstall() {
+    dnf -y install "$@"
+}
+
+pkginstall dnf-utils
+dnf config-manager --set-enabled crb
+# Sadly there's no EPEL for s390x so we just hardcode this for now, it's noarch.
+dnf -y install https://kojipkgs.fedoraproject.org//packages/distribution-gpg-keys/1.98/1.el9/noarch/distribution-gpg-keys-1.98-1.el9.noarch.rpm
+
+# rpm-ostree for builds, and need skopeo to do the container backend
+pkginstall rpm-ostree skopeo
+# For derived container builds
+pkginstall buildah
+# And a rust toolchain
+pkginstall cargo openssl-devel
+
+# Build tools
+pkginstall selinux-policy-targeted osbuild crypto-policies-scripts sudo

builder/coreos-continuous.repo

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+[copr:copr.fedorainfracloud.org:group_CoreOS:continuous]
+name=Copr repo for continuous owned by @CoreOS
+baseurl=https://download.copr.fedorainfracloud.org/results/@CoreOS/continuous/centos-stream-9-$basearch/
+type=rpm-md
+skip_if_unavailable=True
+gpgcheck=1
+gpgkey=https://download.copr.fedorainfracloud.org/results/@CoreOS/continuous/pubkey.gpg
+repo_gpgcheck=0
+enabled=1
+enabled_metadata=1