default + curl, wget, git, cc, make, cmake, tar, gzip, find, zip
runtime lua, bash, posix-essential, unzip
composes lua, bash, posix-essential, unzip, curl, wget, git, cc, make, cmake, tar, gzip, find, zip
Some tools are only useful composed: a pip-installed CLI
needs python as its runtime, bash pulls in coreutils. kapsl
resolves that for you — -e git,python:flake8 composes
explicitly.