MNT: Add user name and email to Docker to appease git/annex/datalad

[effigies]

Fixing an apparent datalad 0.15 regression that causes failures if user.name and user.email aren't set in Docker containers.

[codecov]

Codecov Report

Merging #3378 (235f580) into master (bb125ab) will increase coverage by 0.87%.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #3378 +/- ## ========================================== + Coverage 64.23% 65.11% +0.87%  ========================================== Files 307 307 Lines 40373 40373 Branches 5326 5326 ========================================== + Hits 25935 26288 +353  + Misses 13385 13014 -371  - Partials 1053 1071 +18 

Flag	Coverage Δ
unittests	64.83% <ø> (?)

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Impacted Files	Coverage Δ
nipype/interfaces/spm/preprocess.py	50.44% <0.00%> (+0.88%)	⬆️
nipype/interfaces/freesurfer/model.py	64.19% <0.00%> (+1.12%)	⬆️
nipype/pipeline/engine/utils.py	74.57% <0.00%> (+1.14%)	⬆️
nipype/pipeline/engine/nodes.py	78.63% <0.00%> (+1.26%)	⬆️
nipype/interfaces/freesurfer/preprocess.py	66.37% <0.00%> (+1.66%)	⬆️
nipype/interfaces/cat12/preprocess.py	75.71% <0.00%> (+2.14%)	⬆️
nipype/interfaces/freesurfer/utils.py	63.25% <0.00%> (+2.77%)	⬆️
nipype/interfaces/matlab.py	77.00% <0.00%> (+3.00%)	⬆️
nipype/info.py	87.50% <0.00%> (+3.12%)	⬆️
nipype/utils/config.py	63.24% <0.00%> (+3.78%)	⬆️
... and 11 more

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[effigies]

Quick fix. Merging.