Log into docker to avoid hitting IP-based rate limits

[mih]

Closes #230

[codeclimate]

Code Climate has analyzed commit a93430c and detected 0 issues on this pull request.

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[mih]

Worked. Will merge.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8ea5c94) 94.59% compared to head (a93430c) 94.59%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #235   +/-   ##
=======================================
  Coverage   94.59%   94.59%           
=======================================
  Files          25       25           
  Lines        1091     1091           
=======================================
  Hits         1032     1032           
  Misses         59       59           

see 1 file with indirect coverage changes

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