feat(instance): server create with additional volumes sbs

[Codelax]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.86822% with 35 lines in your changes missing coverage. Please review.

Project coverage is 70.96%. Comparing base (5bf53e0) to head (8dc559f).
Report is 377 commits behind head on master.

Files with missing lines	Patch %	Lines
...spaces/instance/v1/custom_server_create_builder.go	77.57%	17 Missing and 7 partials ⚠️
...nal/namespaces/instance/v1/custom_server_create.go	50.00%	8 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4329      +/-   ##
==========================================
- Coverage   75.45%   70.96%   -4.50%     
==========================================
  Files         202      294      +92     
  Lines       44323    65462   +21139     
==========================================
+ Hits        33444    46454   +13010     
- Misses       9653    17377    +7724     
- Partials     1226     1631     +405     

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