Initial support for container-ized build.

k8s/Dockerfile

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+FROM quay.io/centos/centos:stream9
+
+RUN dnf install -y 'dnf-command(copr)' && \
+    dnf copr enable -y @osbuild/osbuild && \
+    dnf install -y osbuild osbuild-tools osbuild-ostree make sudo
+
+RUN useradd -m -G wheel -s /bin/bash -u 1000 j7s && \
+    bash -c 'echo "%wheel  ALL=(ALL)       NOPASSWD: ALL" >> /etc/sudoers.d/container' && \
+    chmod 0440 /etc/sudoers.d/container
+
+USER j7s

k8s/build.sh

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+sudo podman build \
+     -t j7s-os-builder:latest \
+     -f k8s/Dockerfile .

k8s/run.sh

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+sudo podman run --rm \
+     --privileged \
+     -v $PWD:/project:Z \
+     -w /project \
+     localhost/j7s-os-builder:latest \
+     make cs9-qemu-minimal-ostree.x86_64.repo