fix: Prevent update loop with git write-back

[jannfis]

Signed-off-by: jannfis jann@mistrust.net

This will hopefully fix #170.

Prevent an update loop with Git write-back when not all of the images needed update by including also the non-updated images in the list of images to update.

[codecov]

Codecov Report

Merging #171 (6286514) into master (af590d3) will decrease coverage by 0.00%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
- Coverage   68.21%   68.20%   -0.01%     
==========================================
  Files          19       19              
  Lines        1337     1343       +6     
==========================================
+ Hits          912      916       +4     
- Misses        343      344       +1     
- Partials       82       83       +1     

Impacted Files	Coverage Δ
pkg/argocd/update.go	71.60% <46.15%> (-0.13%)	⬇️

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