Add example for helm chart in private repo

README.md

@@ -18,3 +18,4 @@ to explore ArgoCD and GitOps!
 | [plugins](plugins/) | Apps which demonstrate config management plugins usage |
 | [blue-green](blue-green/) | Demonstrates how to implement blue-green deployment using [Argo Rollouts](https://github.com/argoproj/argo-rollouts)
 | [apps](apps/) | An app composed of other apps |
+| [private-helm-repo-with-values-yaml](private-helm-repo-with-values-yaml/)| A helm chart from a private repository with a values yaml from a private git repository |

private-helm-repo-with-values-yaml/README.md

@@ -0,0 +1,79 @@
+# Deploying a helm chart from a private repository with a values yaml from a private git repository
+
+Let's assume that the helm chart is located in a private helm repository (e.g. nexus) and the `values.yaml` to configure the helm chart also comes from a private git repository.
+
+## Configure the private helm repository
+
+Deploy a secret to ArgoCD's namespace with this content (replace user and password):
+```
+apiVersion: v1
+kind: Secret
+metadata:
+  name: nexus-helm-repo
+  namespace: argocd
+  labels:
+    argocd.argoproj.io/secret-type: repository
+type: Opaque
+stringData:
+  name: nexus
+  type: helm
+  url: https://nexus.example.com/repository/my-helm-repo/
+  username: ...
+  password: ...
+```
+
+For Nexus you might need to use the OAuth2 token as password.
+
+## Configure access to the config git repository 
+
+* Create a token for the config repo in your git repository
+* Deploy a secret with this content to ArgoCD's namespace (set the created token as `password`):
+```
+apiVersion: v1
+kind: Secret
+metadata:
+  name: git-repo-secret
+  namespace: argocd
+  labels:
+    argocd.argoproj.io/secret-type: repository
+type: Opaque
+stringData:
+  type: git
+  url: https://github.com/my-user/my-config-repo.git
+  username: doesnotmatter
+  password: myGitConfigRepoToken
+```
+
+## Define your application
+
+Deploy a this custom resource to ArgoCD's namespace with this content:
+
+```
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: my-app
+  namespace: argocd
+spec:
+  project: default
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: mynamespace
+  sources:
+    - repoURL: https://github.com/my-user/my-config-repo.git
+      path: .
+      targetRevision: main
+      ref: configrepo
+    - repoURL: https://nexus.example.com/repository/my-helm-repo/
+      targetRevision: 1.4.0
+      helm:
+        valueFiles:
+          - values.yaml
+          - $configrepo/values.yaml
+      chart: mychart
+```
+
+### Explanation
+
+* The first entry in `sources` defines the config repo where the `values.yaml` is located in the root folder (`path: .`). We give it the reference name `configrepo` which is used below.
+* The second entry in `sources` defines the helm repository from where we want to install the chart `mychart` in version `1.4.0`. To configure the chart we use the default `values.yaml` from the helm chart (first entry) and the `values.yaml` from `configrepo` defined above.