fix: add registry type for tilt

[gabyx]

Proposed Changes

• Add registry type RegistryTilt which will compute the image ref from tilt env. vars.

Types of Changes

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• A bug fix (non-breaking change which fixes an issue). Use MR tag
  bugfix.
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• A breaking change (fix or feature that would cause existing
  functionality to not work as expected). Use MR tag feature.
• A non-productive update (documentation, tooling, etc. if none of the
  other choices apply). Use MR tag chore.

Checklist

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Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 18 lines in your changes missing coverage. Please review.

Project coverage is 59.25%. Comparing base (2ccc079) to head (fcc69c8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/registry/registry-type.go	7.69%	12 Missing ⚠️
pkg/image/images.go	33.33%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   58.99%   59.25%   +0.25%     
==========================================
  Files          87       87              
  Lines        4468     4481      +13     
==========================================
+ Hits         2636     2655      +19     
+ Misses       1611     1601      -10     
- Partials      221      225       +4     

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