"Everything in one step" approach clashes with workflows where the dev container is treated as one target platform.

It's awkward that, if there are 10 linearly-dependent steps to testing my project, I have to put them all into one devcontainer `runCmd` when the devcontainer is treated as a target platform in my matrix strategy. All the other platforms get distinct workflow steps but I have to intentionally not run any of those on the dev container and instead run one unified step.