tracking issue: variant with local kits milestone

[webern]

Use this as a tracking issue for all issues needed such that Twoliter can build a variant using local kits. In other words, change the Bottlerocket build so that kits are being created and used on-the-fly during the Bottlerocket build.

• [ ] #56
• [x] #19
• [ ] #73
• [x] #71