We have bootc scenario separation into pre-submits / periodics, but not when building the container images. The current bootc image build times are over 40m, which constitutes half of the total job runtime.

One way of optimizing the build time would be to separate containerfiles into pre-submits / periodics and not building periodics in pre-submit jobs.

Note that:

1. We already have that separation for ostree builds, so we should follow the same pattern for bootc
2. The separation will require reshuffling scenarios and moving some to periodics (especially the offline + AI ones, which are the heaviest).