Fix/helm values wbc

[askhari]

This PR relates to the previous PRs, issues and comments:

• Issue: Git write-back-target helmvalues does not replace tag and repo in the image section #744
• PR: feat: multisource support #636
• Comment from @zagr0 on Multiple helm sources: skipping app of type '' because it's not of supported source type #558

These changes solve the following issues:

1. does not search into the YAML hierarchy (Git write-back-target helmvalues does not replace tag and repo in the image section #744 ): now this feature will search for the key name on the root node of the YAML file. If it doesn't exist, then it will navigate the YAML hierarchy to look for the right key. If it does not find the key, then it will fail.
2. Currently it messes up the order of the keys in the YAML: with these changes, we got rid of the Conflate library and use a yaml.MapSlice object instead. This way we can preserve the order and avoid messing up the YAML order when writing back to the repository.

To preserve retrocompatibility in case someone already use dots in the YAML keys, we first look for the complete key with dots. Then, if it's not found we go through the YAML hierarchy to find the key.

For example, using an annotation like this: argocd-image-updater.argoproj.io/labcat.helm.image-tag: rollout.image.tag; first we'll try to find a key named "rollout.image.tag" in the YAML root node. And if we do not find it, then it will search the YAML hierarchy searching the following structure:

rollout:
  image:
    tag: <your preferred value>

There are new tests for these code.

Please, comments or suggestions are more than welcome.

Cheers!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.20%. Comparing base (a309127) to head (767175c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #748      +/-   ##
==========================================
+ Coverage   55.71%   56.20%   +0.48%     
==========================================
  Files          31       31              
  Lines        3060     3094      +34     
==========================================
+ Hits         1705     1739      +34     
  Misses       1218     1218              
  Partials      137      137              

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[chengfang]

Can we just return here since we've set the value and nothing else needs to be done?

[alexismaior]

I tested locally with a similar configuration and it worked like a charm! Thanks for working on this.

[chengfang]

Thanks @askhari for the fix, and thanks @alexismaior for verifying it!

[seagyn]

Thanks for this fix. We've just run into the issue, is there an expected ETA for a new release of image updater or an image we can use in the mean time?

[pasha-codefresh]

I am going to create release on Monday

[seagyn]

I am going to create release on Monday

Appreciate it!