Fedora IoT derived bootc image is defined and composed automatically

[miabbott]

Outcomes

• using the Fedora bootc base image, additional required packages are determined for Fedora IoT
• using the Fedora bootc base image, additional required configuration is determined for Fedora IoT
• required changes to Fedora pungi config are made to support above items
• Fedora IoT bootc image is composed regularly
• Fedora IoT bootc image is pushed to a publicly available registry regularly
• gating tests are enabled to prevent a broken Fedora IoT bootc image from being pushed to the registry
• documentation updates are made to the Fedora IoT docs describing how to find and use the Fedora IoT bootc image

Depends on #18

[cgwalters]

Just looking at this, I think perhaps a confusion here is that it wasn't clear whether "Fedora IoT bootc" is its own base image or not.

required changes to Fedora pungi config are made to support above items

Kind of implies that it's a base image (not strictly I guess...but building layered images in pungi would certainly be new territory for it) and we have a lot of container-native buildsystems available.