feat: add argocd documentation

# ArgoCD

## Install ArgoCD

```bash

kubectl create namespace argocd

kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

```

## Get initial admin password

```bash

kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d

```

## Boostrap the ArgoCD configuration using a Git repository

The manifests for the ArgoCD configuration are stored in a git repository. The repository in this example is located at

`https://gitlab.simoncor.net/kaas/argocd.git` and the path within the repository is `argocd/`.

In this subfolder we have an ArgoCD Application manifest which bootstraps the ArgoCD configuration.

We also have other manifests for configuring ArgoCD ingress configuration and applications.

```bash

kubectl apply -f - <<EOF

---

apiVersion: "argoproj.io/v1alpha1"

kind: "Application"

metadata:

  name: "argocd"

  namespace: "argocd"

spec:

  project: "default"

  source:

    repoURL: "https://gitlab.simoncor.net/kaas/argocd.git"

    path: "argocd/"

    targetRevision: "main"

    directory:

      recurse: true

      jsonnet: {}

  destination:

    server: "https://kubernetes.default.svc"

    namespace: "argocd"

  syncPolicy:

    automated:

      prune: true

      selfHeal: true

    syncOptions:

      - "CreateNamespace=true"

EOF

```

## ArgoCD Applications

This is an example of an ArgoCD Application manifest which deploys this MkDocs application.

```yam

---

apiVersion: "argoproj.io/v1alpha1"

kind: "Application"

metadata:

  name: "docs-simoncor-net"

  namespace: "argocd"

spec:

  project: "default"

  source:

    repoURL: "https://gitlab.simoncor.net/kaas/docs-simoncor-net.git"

    path: "manifests/"

    targetRevision: "main"

  destination:

    server: "https://kubernetes.default.svc"

    namespace: "docs-simoncor-net"

  syncPolicy:

    automated:

      prune: true

      selfHeal: true

      enabled: true

    syncOptions:

      - "CreateNamespace=true"

```