Add Ability to Clone Private Charts Repos

[stevenpall]

• Check if $GITHUB_TOKEN environment variable exists (personal access token) and if it does, use it to clone private charts repos
• Add documentation on how to use this feature
• Closes #14

[stevenpall]

I think the push-container job needs a conditional to only run on pushes to master, otherwise PRs will fail:

on:
  push:
    branches:    
      - master

[stefanprodan]

I’ll have to fix the CI and make the container push only for master branches and tags.

[edshelton]

This does not account for cases where the ssh:// prefix is not included in the HelmRelease manifest (because it isn't required).

e.g.

spec:
  chart:
    git: git@github.com:my-org/my-helm-charts
    path: my-chart
    ref: master

[stevenpall]

@edshelton This should just work. The only thing we're doing here is substituting ssh:// for git@. Is it not working for you?

[edshelton]

The 's/ssh:\/\/git@//' sed expression is removing the entire ssh://git@ prefix, not just ssh://. If you only have git@ in your HelmRelease, this won't remove that prefix because it doesn't start with ssh://. My latest PR separates the two :)