Goal: improve S2I v1 to lay the foundation for S2I v2

Problem: 

Why is this important: 

Dependencies (internal and external):

Prioritized epics + deliverables (in scope / not in scope):

• Inspect builder image for S2I configs before generating Dockerfile #973
• Build images with “s2i build” using external builders (Docker, buildah, and podman) #966
• Publish an image containing S2I tools in Quay with each S2I release

Estimate (XS, S, M, L, XL, XXL): 

Previous Work:

Customers:

Open questions: