Agent Skills: docker-containerization

World-class container image building - Dockerfiles, multi-stage builds, security hardening, and the battle scars from images that broke in productionUse when "docker, dockerfile, container, image, docker-compose, build, multi-stage, alpine, distroless, scratch, docker build, docker run, registry, ecr, gcr, dockerhub, layer, cache, docker, containers, dockerfile, images, containerization, devops, cloud-native, microservices" mentioned.