TST: Build workflow across different conditions

[mgxd]

Addresses #378

[codecov]

Codecov Report

Attention: Patch coverage is 96.91358% with 5 lines in your changes missing coverage. Please review.

Project coverage is 55.89%. Comparing base (8cc8db2) to head (e5124cc).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
nibabies/workflows/tests/__init__.py	94.28%	0 Missing and 2 partials ⚠️
nibabies/workflows/anatomical/fit.py	75.00%	1 Missing ⚠️
nibabies/workflows/base.py	50.00%	1 Missing ⚠️
nibabies/workflows/tests/test_base.py	99.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #409       +/-   ##
===========================================
+ Coverage   38.47%   55.89%   +17.41%     
===========================================
  Files          66       68        +2     
  Lines        6319     6477      +158     
  Branches      975      809      -166     
===========================================
+ Hits         2431     3620     +1189     
+ Misses       3802     2658     -1144     
- Partials       86      199      +113     

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