Add docker_image_name field on WorkerVersion serializer

mentioned in merge request tasks!98 (merged)

Codecov Report

Merging #796 into master will decrease coverage by 0.00%. The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master     #796      +/-   ##
==========================================
- Coverage   86.58%   86.57%   -0.01%     
==========================================
  Files         207      207              
  Lines       13760    13770      +10     
==========================================
+ Hits        11914    11922       +8     
- Misses       1846     1848       +2

Impacted Files	Coverage Δ
arkindex/dataimport/models.py	`45.83% <50.00%> (+0.07%)`
arkindex/dataimport/serializers/workers.py	`100.00% <100.00%> (ø)`
arkindex/dataimport/tests/test_workers.py	`100.00% <100.00%> (ø)`

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