feat: argocd custom helm chart values exposed as a release artifact

[zaremba-tomasz]

What does this PR do?

In order to avoid the need to download the whole initium-platform repository just to install ArgoCD with custom values, additional artifact is being published to be used within helm upgrade --install command like below one:

helm upgrade --install argocd argo-cd \
  --repo https://argoproj.github.io/argo-helm \
  --values ./argocd-helm-values.yaml \
  --version 5.16.14 \
  --namespace argocd \
  --create-namespace

According to this doc yq should be available on GH runner.

Successfully tested on local, all works as expected (ArgoCD exluded from tilt up, installed with the above helm command).

When this one is merged and released we need to update the quick-start guides for all the clouds.

Related issues

Closes nearform/initium#15

Checklist before merging

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have checked the contributing document.
• I have checked the existing Pull Requests to see whether someone else has raised a similar idea or question.
• I have added tests that prove my fix is effective or that my feature works.