Chart: Dont use hardcoed postgres image for initcontainer

[terrpan]

Problem

The marquez deployment has a Postgresql wait-for-db init container with a hardcoded image. Due to this the global.imageRegistry value is not used for the "wait-for-db" init container. This creates problems for users that has to use private registries.

Closes: #ISSUE-NUMBER

Solution

I have added a template in chart/templates/helpers.tpl for the postgres image that returns the value from the postgres chart, or the global.imageRegistry input value . The template is then included in thechart/templates/marquez/deployment.yaml "wait-for-db" initContainer.

One-line summary:

Use the same postgresql image value for postgres and "wait-for-db" initcontainer.

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[boring-cyborg]

Thanks for opening your first pull request in the Marquez project! Please check out our contributing guidelines (https://github.com/MarquezProject/marquez/blob/main/CONTRIBUTING.md).

[codecov]

Codecov Report

Merging #2579 (c8038a8) into main (0322365) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2579   +/-   ##
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  Coverage     83.28%   83.28%           
  Complexity     1287     1287           
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  Files           243      243           
  Lines          5936     5936           
  Branches        279      279           
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  Hits           4944     4944           
  Misses          845      845           
  Partials        147      147           

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[wslulciuc]

LGTM 👍

[boring-cyborg]

Great job! Congrats on your first merged pull request in the Marquez project!