Add custom image name configuration

[paul-kang-1]

Changelog

• Enables the replacement of the image name of a preset via WithCustomImage function
• Fixes Feature: Configurable Docker Registry URL #1023

Details

Although I initially attempted to find a way to only replace the registry name, there wasn't a clean way to separate the registry name from the repository name. For example, the registry of the image docker.io/library/mongo:latest would be docker.io/library (everything before the last slash), whilst the registry for docker.io/mysql/mysql-server:latest would simply be docker.io.

With such ambiguity, it would be better to let the user to define both the registry name and the repository name. (Also if one uses a custom registry, the subdirectories of the repository name would likely differ anyways)

Another way to implement this feature could be to redefine the internal representation of images from string to a custom type w/ internal fields for registry/repository/name, etc. However, this would require changing the image definitions for all presets, but may be more flexible in the long run.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.54%. Comparing base (97f7ed9) to head (326f3b5).
Report is 34 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (97f7ed9) and HEAD (326f3b5). Click for more details.

HEAD has 14 uploads less than BASE

Flag	BASE (97f7ed9)	HEAD (326f3b5)
	17	3

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1072       +/-   ##
===========================================
- Coverage   85.87%   33.54%   -52.33%     
===========================================
  Files          50       55        +5     
  Lines        2350     2623      +273     
===========================================
- Hits         2018      880     -1138     
- Misses        173     1665     +1492     
+ Partials      159       78       -81     

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[orlangure]

Thank you for working on this 😼
Looks great!