these problems are general ones and the solution is the same as running programs in parallel or across machines. When needing to build different architectures (and needing a host to provide the toolchains), what's stopping you from issuing more than 1 command in your CI/CD pipeline? Most pipelines have a way of running something on a specific host. So does k8s, ecs, <pick your provider>, and probably your IT team.

My experience, when it gets time to actually build the thing. A one-liner (with args if you need them) is the best approach. If you really REALLY need to, you can have more than one script for doing it - depending on what path down the pipeline you take. Maybe it's

    1) ./build.sh -config Release
    2) ./deploy.sh -docker -registry=<$REGISTRY> --kick

The point I made is I hate when I see 42 lines in a build workflow yaml that isn't syntax highlighted because it's been |'d in there. I think the yaml's of your pipelines, etc, should be configuration for the pipeline and the actual execution should be outsourced to a script you provide.