feat: Add bootc support (#448)

Adds support for using `bootc` as the preferred method for booting from
a locally created image. This new method gets rid of the need to create
a tarball and move it to the correct place and instead it will make use
of `podman scp` which copies the image to the root `containers-storage`
and then has `rpm-ostree` and `bootc` boot from that store.

Closes #418 
Closes #200

scripts/post_build.sh

@@ -1,9 +1,10 @@
 #!/usr/bin/env bash
 
 set -euo pipefail
+. /scripts/exports.sh
 
 rm -rf /tmp/* /var/*
 
-# if command -v bootc > /dev/null; then
-#   bootc container lint
-# fi
+if feature_enabled "bootc" && command -v bootc > /dev/null; then
+  bootc container lint
+fi