fix(gitops): split ApplicationSet for dev Image Updater support

- Split tenant-apps into tenant-apps-dev (with Image Updater) and tenant-apps (tst/stg/prd)
- Enable goTemplate for proper variable interpolation
- Image Updater writes to tenants/.../overlays/dev/values.yaml
- Remove legacy base/application.yaml (now managed by ApplicationSet)
- Remove legacy clusters/dev/chat-values.yaml

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justgithubaccount

clusters/dev/chat-values.yaml

@@ -1,9 +1,11 @@
 apiVersion: argoproj.io/v1alpha1
 kind: ApplicationSet
 metadata:
-  name: tenant-apps
+  name: tenant-apps-dev
   namespace: argocd
 spec:
+  goTemplate: true
+  goTemplateOptions: ["missingkey=error"]
   generators:
     - matrix:
         generators:
@@ -15,6 +17,64 @@ spec:
               elements:
                 - cluster: in-cluster
                   env: dev
+  template:
+    metadata:
+      name: '{{ .team }}-{{ .app }}-{{ .env }}'
+      namespace: argocd
+      labels:
+        team: '{{ .team }}'
+        app: '{{ .app }}'
+        env: '{{ .env }}'
+      annotations:
+        argocd-image-updater.argoproj.io/image-list: chat=ghcr.io/justgithubaccount/chat-api:~1
+        argocd-image-updater.argoproj.io/chat.update-strategy: semver
+        argocd-image-updater.argoproj.io/chat.helm.image-tag: image.tag
+        argocd-image-updater.argoproj.io/write-back-method: git
+        argocd-image-updater.argoproj.io/write-back-target: 'kustomization:tenants/{{ .team }}/apps/{{ .app }}/overlays/{{ .env }}/values.yaml'
+        argocd-image-updater.argoproj.io/git-branch: main
+      finalizers:
+        - resources-finalizer.argocd.argoproj.io
+    spec:
+      project: tenants
+      destination:
+        name: '{{ .cluster }}'
+        namespace: '{{ .team }}'
+      sources:
+        - repoURL: https://github.com/justgithubaccount/app-poly-gitops-helm
+          targetRevision: main
+          path: chat
+          helm:
+            valueFiles:
+              - values.yaml
+              - $values/values.yaml
+        - repoURL: https://github.com/justgithubaccount/app-poly-gitops-k8s
+          targetRevision: main
+          path: 'tenants/{{ .team }}/apps/{{ .app }}/overlays/{{ .env }}'
+          ref: values
+      syncPolicy:
+        automated:
+          prune: true
+          selfHeal: true
+        syncOptions:
+          - CreateNamespace=true
+---
+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: tenant-apps
+  namespace: argocd
+spec:
+  goTemplate: true
+  goTemplateOptions: ["missingkey=error"]
+  generators:
+    - matrix:
+        generators:
+          - list:
+              elements:
+                - app: chat
+                  team: product-team
+          - list:
+              elements:
                 - cluster: tst-cluster
                   env: tst
                 - cluster: stg-cluster
@@ -23,19 +83,19 @@ spec:
                   env: prd
   template:
     metadata:
-      name: '{{team}}-{{app}}-{{env}}'
+      name: '{{ .team }}-{{ .app }}-{{ .env }}'
       namespace: argocd
       labels:
-        team: '{{team}}'
-        app: '{{app}}'
-        env: '{{env}}'
+        team: '{{ .team }}'
+        app: '{{ .app }}'
+        env: '{{ .env }}'
       finalizers:
         - resources-finalizer.argocd.argoproj.io
     spec:
       project: tenants
       destination:
-        name: '{{cluster}}'
-        namespace: '{{team}}'
+        name: '{{ .cluster }}'
+        namespace: '{{ .team }}'
       sources:
         - repoURL: https://github.com/justgithubaccount/app-poly-gitops-helm
           targetRevision: main
@@ -46,7 +106,7 @@ spec:
               - $values/values.yaml
         - repoURL: https://github.com/justgithubaccount/app-poly-gitops-k8s
           targetRevision: main
-          path: tenants/{{team}}/apps/{{app}}/overlays/{{env}}
+          path: 'tenants/{{ .team }}/apps/{{ .app }}/overlays/{{ .env }}'
           ref: values
       syncPolicy:
         automated:

platform/gitops/appsets/tenant-apps.yaml

@@ -1,5 +1,6 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
-resources:
-  - application.yaml
+# Application managed by ApplicationSet in platform/gitops/appsets/tenant-apps.yaml
+# This directory contains shared resources for the chat application
+resources: []