fix(instance): image create additional volumes field

[Codelax]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c4bde53) 75.74% compared to head (69d2bef) 75.74%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3410   +/-   ##
=======================================
  Coverage   75.74%   75.74%           
=======================================
  Files         175      175           
  Lines       39149    39149           
=======================================
  Hits        29655    29655           
  Misses       8421     8421           
  Partials     1073     1073           

Files	Coverage Δ
internal/namespaces/instance/v1/custom_image.go	81.56% <100.00%> (ø)

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