Add ability to add worker_img_url from yaml

[Harshit28j]

Creating a challenge

Ensuring that field contain the value at the backend

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.30%. Comparing base (96968d6) to head (2444bb6). Report is 1118 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4421      +/-   ##
==========================================
- Coverage   72.93%   69.30%   -3.63%     
==========================================
  Files          83       20      -63     
  Lines        5368     3574    -1794     
==========================================
- Hits         3915     2477    -1438     
+ Misses       1453     1097     -356     

see 64 files with indirect coverage changes

see 64 files with indirect coverage changes

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