feat: deploy argocd-image-updater via Helm

Deploys ArgoCD Image Updater into the argocd-image-updater namespace.
Vault-managed secrets provide registry credentials for git.unkin.net
and an ArgoCD API token.

Prerequisites before syncing:
- Create Vault role argocd-image-updater in k8s/au/syd1
- Populate kv/service/argocd-image-updater/registry-creds (key: creds, value: <user>:<token>)
- Create ArgoCD local user image-updater and store token at kv/service/argocd-image-updater/argocd-token

apps/base/argocd-image-updater/kustomization.yaml

@@ -0,0 +1,8 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - vaultauth.yaml
+  - vaultstaticsecret.yaml

apps/base/argocd-image-updater/namespace.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: argocd-image-updater

apps/base/argocd-image-updater/vaultauth.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultAuth
+metadata:
+  name: default
+  namespace: argocd-image-updater
+spec:
+  allowedNamespaces:
+    - argocd-image-updater
+  kubernetes:
+    audiences:
+      - vault
+    role: argocd-image-updater
+    serviceAccount: argocd-image-updater
+    tokenExpirationSeconds: 600
+  method: kubernetes
+  mount: k8s/au/syd1
+  vaultConnectionRef: vso-system/default

apps/base/argocd-image-updater/vaultstaticsecret.yaml

@@ -0,0 +1,40 @@
+---
+# Credentials for polling the git.unkin.net container registry.
+# Vault KV path: kv/service/argocd-image-updater/registry-creds
+# Required key: creds — value format: "<username>:<token>"
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: registry-creds
+  namespace: argocd-image-updater
+spec:
+  destination:
+    create: true
+    name: registry-creds
+    overwrite: true
+  hmacSecretData: true
+  mount: kv
+  path: service/argocd-image-updater/registry-creds
+  refreshAfter: 5m
+  type: kv-v2
+  vaultAuthRef: default
+---
+# ArgoCD API token for image updater to discover and update Applications.
+# Vault KV path: kv/service/argocd-image-updater/argocd-token
+# Required key: token — generate via: argocd account generate-token --account image-updater
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: argocd-token
+  namespace: argocd-image-updater
+spec:
+  destination:
+    create: true
+    name: argocd-token
+    overwrite: true
+  hmacSecretData: true
+  mount: kv
+  path: service/argocd-image-updater/argocd-token
+  refreshAfter: 5m
+  type: kv-v2
+  vaultAuthRef: default

apps/base/artifactapi/resources/conf.d/remote-helm.yaml

@@ -130,3 +130,14 @@ remotes:
     cache:
       immutable_ttl: 0
       mutable_ttl: 3600
+
+  argo-helm:
+    base_url: "https://argoproj.github.io/argo-helm"
+    package: "helm"
+    description: "Argo Project Helm charts (ArgoCD, Image Updater, Rollouts, etc.)"
+    check_mutable_updates: true
+    immutable_patterns:
+      - "\\.tgz$"
+    cache:
+      immutable_ttl: 0
+      mutable_ttl: 3600

apps/base/artifactapi/resources/conf.d/virtual-helm.yaml

@@ -15,3 +15,4 @@ virtuals:
       - stakater
       - traefik
       - victoriametrics
+      - argo-helm

apps/overlays/au-syd1/argocd-image-updater/kustomization.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../../base/argocd-image-updater
+
+helmCharts:
+  - name: argocd-image-updater
+    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
+    version: "0.10.3"
+    releaseName: argocd-image-updater
+    namespace: argocd-image-updater
+    valuesFile: values.yaml

apps/overlays/au-syd1/argocd-image-updater/values.yaml

@@ -0,0 +1,33 @@
+config:
+  argocd:
+    grpcWeb: false
+    serverAddress: argocd-server.argocd
+    insecure: true
+    plaintext: false
+
+  registries:
+    - name: git.unkin.net
+      api_url: https://git.unkin.net
+      prefix: git.unkin.net
+      credentials: secret:argocd-image-updater/registry-creds#creds
+      insecure: false
+
+authScripts:
+  enabled: false
+
+extraEnv:
+  - name: ARGOCD_TOKEN
+    valueFrom:
+      secretKeyRef:
+        name: argocd-token
+        key: token
+
+gitCommitUser: "ArgoCD Image Updater"
+gitCommitEmail: "argocd-image-updater@unkin.net"
+
+rbac:
+  enabled: true
+
+serviceAccount:
+  create: true
+  name: argocd-image-updater

argocd/applicationsets/imageupdater.yaml

@@ -0,0 +1,36 @@
+---
+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: image-updater-apps
+  namespace: argocd
+spec:
+  generators:
+  - git:
+      repoURL: https://git.unkin.net/unkin/argocd-apps
+      revision: HEAD
+      directories:
+      - path: apps/overlays/*/artifactapi
+  template:
+    metadata:
+      name: 'platform-{{path[3]}}'
+      annotations:
+        argocd-image-updater.argoproj.io/image-list: "artifactapi=git.unkin.net/unkin/artifactapi"
+        argocd-image-updater.argoproj.io/artifactapi.update-strategy: semver
+        argocd-image-updater.argoproj.io/write-back-method: git
+        argocd-image-updater.argoproj.io/git-branch: main
+    spec:
+      project: platform
+      source:
+        repoURL: https://git.unkin.net/unkin/argocd-apps
+        targetRevision: HEAD
+        path: '{{path}}'
+      destination:
+        server: https://kubernetes.default.svc
+        namespace: '{{path[3]}}'
+      syncPolicy:
+        automated:
+          prune: true
+          selfHeal: true
+        syncOptions:
+        - ServerSideApply=true

argocd/applicationsets/kustomization.yaml

@@ -4,6 +4,7 @@ kind: Kustomization
 
 resources:
   - aitooling.yaml
+  - imageupdater.yaml
   - observability.yaml
   - platform.yaml
   - storage.yaml

argocd/applicationsets/platform.yaml

@@ -10,7 +10,7 @@ spec:
       repoURL: https://git.unkin.net/unkin/argocd-apps
       revision: HEAD
       directories:
-      - path: apps/overlays/*/artifactapi
+      - path: apps/overlays/*/argocd-image-updater
       - path: apps/overlays/*/cattle-system
       - path: apps/overlays/*/cert-manager
       - path: apps/overlays/*/certificates