feat: Configuring certificate issuers for apps

[gvicentin]

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Codecov Report

Attention: Patch coverage is 74.62687% with 34 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
tsuru/client/certificate.go	74.24%	22 Missing and 12 partials :warning:

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #232   +/-   ##
=======================================
  Coverage        ?   72.94%           
=======================================
  Files           ?       54           
  Lines           ?     9894           
  Branches        ?        0           
=======================================
  Hits            ?     7217           
  Misses          ?     1760           
  Partials        ?      917           

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