feat(chart-updater): continuous deployment of OCI Helm chart type application

[distorhead]

Hi! There is a proposal to implement continuous deployment at the higher logical level than updating images: watch for a new helm chart versions and perform update (and included images will be updated as well). This proposal and possible solutions has been described in-depth in this issue: https://github.com/argoproj/argo-cd/issues/8475.

In this PR I've created MVP to try one solution to the problem and get your feedback if possible.

How it works

Update application targetRevision for an OCI helm chart when new chart version arrives into the container registry based on semver constraints.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #405 (1df2f88) into master (e46a206) will decrease coverage by 2.46%. The diff coverage is 14.70%.

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
- Coverage   65.55%   63.08%   -2.47%     
==========================================
  Files          21       21              
  Lines        2032     2132     +100     
==========================================
+ Hits         1332     1345      +13     
- Misses        571      656      +85     
- Partials      129      131       +2     

Impacted Files	Coverage Δ
pkg/argocd/update.go	53.10% <0.00%> (-16.32%)	:arrow_down:
pkg/argocd/argocd.go	65.13% <60.00%> (-1.26%)	:arrow_down:
pkg/argocd/git.go	64.84% <0.00%> (ø)

:mega: Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[bsg-toby]

@jannfis Could you please review this ? Thank you so much

[dtduc-git]

@jannfis Thanks in advance for your review.

[minhnnhat]

@jannfis We really need this feature!

[mxzinke]

@distorhead Could you accept the licensing and go forward with this feature?

[distorhead]

@distorhead Could you accept the licensing and go forward with this feature?

@mxzinke Hi! I am sorry for delayed response, accepted licensing.

[distorhead]

@jannfis Hi! What do you think about this feature? Does it have any problems with design?

[bsg-toby]

Hi @jannfis,

Could you please take a look on this PR ? Thanks.

[vietwow]

@alexmt @jannfis anyone could take a look this pr ? thanks

[asychev]

Any chance this will go forward?

[vietwow]

I really don't understand what's wrong with this PR and why repo maintainers like @jannfis don't care about this while many people are waiting for this.