Added helm remote repo example

[dhodun]

Fixes: #5517
Added helm remote repo example, per @gsquared94

[codecov]

Codecov Report

Merging #5640 (03deae4) into master (fd96d77) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5640      +/-   ##
==========================================
- Coverage   70.68%   70.67%   -0.02%     
==========================================
  Files         408      408              
  Lines       15581    15581              
==========================================
- Hits        11014    11012       -2     
- Misses       3757     3758       +1     
- Partials      810      811       +1     

Impacted Files	Coverage Δ
pkg/skaffold/util/tar.go	50.66% <0.00%> (-5.34%)	⬇️
pkg/skaffold/docker/parse.go	85.40% <0.00%> (+1.08%)	⬆️

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[bouckj]

Is there any documentation for how to add authentication to a remote Helm repo?

For instance, using a private GitHub repo as a Helm repo I need to provide my GitHub access token when adding the Helm repo if I do it manually:

helm repo add example-repo --username "<GITHUB_USERNAME>" --password "<GITHUB_ACCESS_TOKEN>" 'https://raw.githubusercontent.com/my/helm/repo/'

I don't see how to instruct Skaffold to add the username and password when using the 'repo' and 'remoteChart' options. I see there's a 'useHelmSecrets' config option, but can't find a single example using it anywhere similar to my case.

[briandealwis]

@bouckj There is no support for adding Helm repositories on-the-fly though there has been a little bit of discussion on #2653. For now you would need to do this outside of Skaffold.

Perhaps you could sketch how you add the repository currently on #2653 and describe how you retrieve the username and password secret?