I am working on something like this: https://github.com/combust-labs/firebuild https://github.com/combust-labs/firebuild. From a Dockerfile, it's not as simple

I am working on something like this: https://github.com/combust-labs/firebuild https://github.com/combust-labs/firebuild. From a Dockerfile, it's not as simple without creating an image first. The command @tptacek means is most likely docker export for a running container and docker save for an image. First exports selected paths, second exports a complete image as a tgz archive.