feat(core): DockerCompose: support list of env_files

[mavcook]

It is useful to be able to pass a list of env_files, especially since you can pass a list of compose_file_names.
Builds upon #135, matching compose_file_name.

[mavcook]

Not sure who is best to ask, so I will try @alexanderankin 😛

Could you or someone take a look at this when they have a chance? It is a backwards compatible 6 line change, so hopefully it will be painless. Thanks!

(Apologies for the pestering if you just haven't had time to see this PR yet)

[alexanderankin]

lgtm

[mavcook]

Thanks! It looks like the PR still needs approval to run the workflows before it can be merged?

[alexanderankin]

i was gonna rerun the failed runs from before and then there was a merge which means all jobs have to run again, so i have to start over and hope for no pypi timeouts this time (they are quite rare to be fair)

[mavcook]

oops my bad! I shouldn't have done that merge (thought it was blocking the PR)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Coverage        ?   81.79%           
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  Files           ?       14           
  Lines           ?      890           
  Branches        ?      140           
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  Hits            ?      728           
  Misses          ?      127           
  Partials        ?       35           

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