fix: FROM path in Dockerfile recommendation

[jbouter]

Pulling from argoproj/argocd:latest uses the preferred registry from the user. If this is dockerhub, it will pull a very outdated image of argocd.

Description

The docs recommend using a FROM that can possibly be broken

Fixes: <! -- link to issue -->

Checklist

Please make sure that your PR fulfills the following requirements:

• Reviewed the guidelines for contributing to this repository
• The commit message follows the Conventional Commits Guidelines.
• Tests for the changes have been updated
• Are you adding dependencies? If so, please run go mod tidy -compat=1.21 to ensure only the minimum is pulled in.
• Docs have been added / updated
• Optional. My organization is added to USERS.md.

Type of Change

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

Other information

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.55%. Comparing base (42a43f0) to head (8806a0f).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #662      +/-   ##
==========================================
+ Coverage   72.16%   73.55%   +1.38%     
==========================================
  Files          26       26              
  Lines        1994     1588     -406     
==========================================
- Hits         1439     1168     -271     
+ Misses        458      315     -143     
- Partials       97      105       +8     

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