use user's home directory when fetching the docker config

[hellt]

fix #2079

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.45%. Comparing base (17758ab) to head (c637943).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2135      +/-   ##
==========================================
- Coverage   53.48%   53.45%   -0.04%     
==========================================
  Files         168      168              
  Lines       11919    11913       -6     
==========================================
- Hits         6375     6368       -7     
- Misses       4656     4658       +2     
+ Partials      888      887       -1     

Files	Coverage Δ
runtime/docker/auth.go	83.92% <100.00%> (+4.89%)	⬆️
utils/file.go	58.68% <ø> (ø)

... and 1 file with indirect coverage changes