feat: Generate a Containerfile compatible with Buildah <1.24

[gmpinder]

With the addition of #155 , the only way that users will be able to make use of it will be to use buildah/podman. Since our current Containerfile setup requires at least v1.24 of buildah and v4 of podman, we'll need to have support for creating builds without using mounts. Since mounts were originally introduced to reduce the bloat of images, using squash with older versions of buildah will be just as good in terms of saving space.

[gmpinder]

After a lot of local testing, this is not a viable option and is instead being handled with a GHA change blue-build/github-action#41