This post might have multiple titles. “How to speed up rails project CI build times”, “How to reduce docker images size”, “How to save planet by reducing carbon print with smaller docker containers” and so on. Optimizing Continous Delivery process is somewhat of my passion. I think it’s the strong influence one book by Jez Humble’s put on me. When I started helping VAS (first key OSO’s client) with going cloud I wrote TBH very inefficient process of release.