docs(proposal): support for post renderers

[surajnarwade]

Checklist:

• [x] Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• [x] The title of the PR states what changed and the related issues number (used for the release note).
• [x] The title of the PR conforms to the Toolchain Guide
• [ ] I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• [ ] I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• [ ] Does this PR require documentation updates?
• [ ] I've updated documentation as required by this PR.
• [x] I have signed off all my commits as required by DCO
• [ ] I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• [ ] My build is green (troubleshooting builds).
• [ ] My new feature complies with the feature status guidelines.
• [ ] I have added a brief description of why this PR is necessary and/or what this PR solves.
• [ ] Optional. My organization is added to USERS.md.
• [ ] Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

[surajnarwade]

fixes

• https://github.com/argoproj/argo-cd/issues/3698
• https://github.com/argoproj/argo-cd/issues/7623

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 49.48%. Comparing base (f87897c) to head (e8d3bbc). Report is 416 commits behind head on master.

:exclamation: Current head e8d3bbc differs from pull request most recent head d532fd7

Please upload reports for the commit d532fd7 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #16749      +/-   ##
==========================================
- Coverage   49.73%   49.48%   -0.25%     
==========================================
  Files         274      271       -3     
  Lines       48948    47728    -1220     
==========================================
- Hits        24343    23620     -723     
+ Misses      22230    21773     -457     
+ Partials     2375     2335      -40     

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[surajnarwade]

I have the POC on my fork: https://github.com/surajnarwade/argo-cd/compare/5bb7cd9b09f912cdffcb5db49386e1d91137a7e6...a399863e28c5296da8d2f3cae6bbd457195cf3bb for the same.

[aguckenber-chwy]

Heyo, any ETA on when you may get the feature in? I need to use a private helm chart and customize it which is s a LOT more painful than I expected and my options are either to hack it with Kustomize (i.e. this issue) and a Plugin, else if this feature is very soon going to be released I would just use this :)

[mikebryant]

@crenshaw-dev Is there anything more we need to do here, or can this proposal be accepted?

[surajnarwade]

@crenshaw-dev Is there anything more we need in this proposal, can you review again please, TIA 🙏