De-duplicate container setup by adding a function to "docker exec"

[DavidSpickett]

This function just does the 3 lines that were done before, make a cmd, log it, run it. We just don't have to write it out each time, and can't forget one of the lines.

By declaring it each time around the for loop, i is recaptured each time and we don't have to pass it to the function every time.

Simplified example:

>>> for i in range(3):
...     def foo():
...             return i
...     print(foo())
...
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