Add cluster-components applicationset

Refs. swh/infra/sysadm-environment#4525

argocd-configuration/cluster-components/cluster-components-applicationset.yaml

+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: cluster-components
+  namespace: argocd
+spec:
+  generators:
+  - list:
+      elements:
+      - cluster: admin
+        branch: staging-configure-alerting
+        url: https://rancher.euwest.azure.internal.softwareheritage.org/k8s/clusters/c-q2wd4
+      # - cluster: archive-staging-rke2
+      #   branch: staging
+      #   url: https://rancher.euwest.azure.internal.softwareheritage.org/k8s/clusters/c-m-9n5h9nrf
+      # - cluster: archive-production-rke2
+      #   branch: production
+      #   url: https://rancher.euwest.azure.internal.softwareheritage.org/k8s/clusters/c-m-75xcg59s
+      # - cluster: gitlab-staging
+      #   branch: production
+      #   url: https://euwest-gitlab-staging-89229db0.dd8c7b66-1c78-4e28-9fe3-6f454883861d.privatelink.westeurope.azmk8s.io:443
+      # - cluster: gitlab-production
+      #   branch: production
+      #   url: https://euwest-gitlab-production-0a7cd3d5.26178444-6cf1-498d-88b1-e8182a1b74c6.privatelink.westeurope.azmk8s.io:443
+      # - cluster: rancher
+      #   branch: production
+      #   url: https://rancher.euwest.azure.internal.softwareheritage.org/k8s/clusters/local
+  template:
+    metadata:
+      name: '{{cluster}}-cluster-components'
+      namespace: argocd
+    spec:
+      revisionHistoryLimit: 2
+      project: default
+      source:
+        repoURL: 'https://gitlab.softwareheritage.org/swh/infra/ci-cd/swh-charts.git'
+        path: cluster-components
+        targetRevision: '{{branch}}'
+        helm:
+          valueFiles:
+            - 'values/{{cluster}}.yaml'
+          releaseName: '{{cluster}}-cluster-components'
+      destination:
+        # always apply the configuration on the argocd cluster
+        server: {{url}}
+        namespace: argocd
+      syncPolicy:
+        automated:
+          prune: true
+          selfHeal: true
+