Run builds in a container

See merge request !46

* use a flag to determine if we want an RC or not
* Convert rldict and sigdict to an AttributeDict to allow access via
  __getattr__
* add fedora_release variable to configs for controlling icicle
  templates
* build_image.py script to generate per-architecture XML files used by
  imagefactory
* refactor time to call utcnow() once
* add jinja types to development dependencies until we move past jinja
  2.x
* Generate TDL templates per architecture for each image variant on
  demand
* Generate imagefactory and copy commands to execute image build
* Refactor Kubernetes job template to be generic for all current jobs

* use a flag to determine if we want an RC or not
* Convert rldict and sigdict to an AttributeDict to allow access via
  __getattr__
* add fedora_release variable to configs for controlling icicle
  templates
* build_image.py script to generate per-architecture XML files used by
  imagefactory
* refactor time to call utcnow() once
* add jinja types to development dependencies until we move past jinja
  2.x
* Generate TDL templates per architecture for each image variant on
  demand
* Generate imagefactory and copy commands to execute image build
* Refactor Kubernetes job template to be generic for all current jobs

Sync into Main

See merge request !47

* Utils is now empanadas.util.Shared
* Each config now has a profile name to determine latest-Rocky-{} link
  (Results RLBT#0000131)
* Check added to see if an ISO was built at some point, and forcefully
  exit if so
* Lorax tar ball should be in the format of of lorax-X.Y-ARCH to ensure
  there's no collisions between stable, beta, and lh builds

In preparation to build ISO's with mock or parallel podman containers,
treeinfo support was fully added as well as the addition of xorrisofs to
prepare for the future. xorrisofs should also work for both current and
previous releases.

We have also add a currently-pending RLN experiment.

* Configs updated to deal with repo and structure
* Add graft point process
* Start local and podman process for extra ISO builds