feat: add image registry

[jbrockopp]

WIP

xref: go-vela/community#1066

Based off of go-vela/community#1076

Related to go-vela/ui#953

[codecov]

Codecov Report

❌ Patch coverage is 58.40708% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.08%. Comparing base (3b28752) to head (61ce656).

Files with missing lines	Patch %	Lines
api/admin/settings.go	0.00%	16 Missing ⚠️
api/types/settings/compiler.go	55.55%	16 Missing ⚠️
compiler/native/compile.go	20.00%	4 Missing and 4 partials ⚠️
compiler/native/validate.go	90.47%	2 Missing and 2 partials ⚠️
compiler/native/settings.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1427    +/-   ##
========================================
  Coverage   58.08%   58.08%            
========================================
  Files         663      663            
  Lines       25508    25621   +113     
========================================
+ Hits        14816    14882    +66     
- Misses       9995    10036    +41     
- Partials      697      703     +6     

Files with missing lines	Coverage Δ
database/types/settings.go	66.66% <100.00%> (+1.62%)	⬆️
compiler/native/settings.go	0.00% <0.00%> (ø)
compiler/native/validate.go	93.50% <90.47%> (-1.14%)	⬇️
compiler/native/compile.go	73.96% <20.00%> (-1.65%)	⬇️
api/admin/settings.go	0.00% <0.00%> (ø)
api/types/settings/compiler.go	71.05% <55.55%> (-13.95%)	⬇️

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