Refactor Makefile into "inner" and "outer" Makefiles

[data-sync-user]

Our makefiles are responsible for running all of our tasks, but several targets are shaped like:

target: dep1 dep2 dep3

dep1:
  docker run dep1
  
dep2:
  docker run dep2

dep3:
  docker run dep3

or

TASK1 = some bash command
TASK2 = some other bash command

target:
  docker run sh -c "${TASK1} && ${TASK2}"

It would be nice if we could refactor this out into a top level makefile that is responsible for running all the top level tasks, which shell out to docker run <container> make <inner-target>. This should result in a cleaner and more managable task system without adding additional third party dependencies.

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